Home > 2000 (number)

Two thousand (2000) is the natural number following 1999 and preceding 2001.

See also: millennium, year 2000 AD, Y2K.

Two thousand is the highest number expressible using only two unmodified characters in roman numerals (MM).

Two thousand is also:

• In the name of the products Lever 2000 and Grecian 2000 .
• In Star Trek, the registry number of the USS Excelsior, NX-2000 in Star Trek III: The Search for Spock, and NCC-2000 commanded by Hikaru Sulu in Star Trek VI: The Undiscovered Country.

Selected numbers in the range 2001-2999

2001 - sphenic number

2003 - Sophie Germain primeAnalytic number theory A prime number p is called a Sophie Germain prime if 2''p + 1 is also prime. They acquired significance because of Sophie Germain's proof that Fermat's last theorem is true for such primes. It is conjectured that there are infinitel

2016 - triangular numberA triangular number is a number that can be arranged in the shape of an equilateral triangle. The sequence of triangular numbers (sequence in OEIS) for n 1, 2, 3. is:

1, 3, 6, 10, 15, 21, 28, 36, 45, 55,. Since each row is one unit longer than the previ

2017 - Mertens functionIn number theory, the Mertens function is

where μ(k) is the Mobius function. Because the Mobius function has only the return values -1, 0 and +1, it's obvious that the Mertens function moves slowly and that there is no x such that M ''x > x''. The Me zero

2024 - tetrahedral numberA tetrahedral number or triangular pyramidal number is a figurate number that represents a pyramid with a base and three sides, that is, a tetrahedron. The tetrahedral number for n is the sum of the first n triangular numbers added up. The first few tetra

2025 - sum of the cubes of the first nine integers, 45^2

2027 - safe primeA safe prime is a prime number of the form 2''p + 1, where p is also a prime. Conversely, the prime p is a Sophie Germain prime. The first few safe primes are 5, 7, 11, 23, 47, 59, 83, 107, 167, 179, 227, 263, 347, 359, 383, 467, 479, 503, 563, 587, 719,

2030 = 21² + 22² + 23² + 24² = 25² + 26² + 27²

2031 - centered pentagonal numberA centered pentagonal number is a centered figurate number that represents a pentagon with a dot in the center and all other dots surrounding the center in successive pentagonal layers. The centered pentagonal number for n is given by the formula. The fir

2039 - Sophie Germain prime, safe prime

2047 - super-Poulet numberA super-Poulet number is a Poulet number whose every divisor d divides 2''d 2. For example 341 is a super-Poulet number: it has positive divisors {1, 11, 31, 341} and we have:

(211 2) / 11 2046 / 11 186 :(231 2) / 31 2147483646 / 31 69273666 :(2341 2) /, Woodall numberIn mathematics, a Woodall number or Riesel number is a natural number of the form n · 2''n − 1 (written W . Woodall numbers were first studied by A. Cunningham and H. Woodall in 1917, inspired by James Cullen's earlier study of the similarly-defined, decagonal number

2048 - power of two

2056 - magic constant of n×n magic square and n-Queens Problem for n = 16.

2063 - Sophie Germain prime, safe prime

2069 - Sophie Germain prime

2070 - pronic number

2080 - triangular number

2093 - Mertens function zero

2095 - Mertens function zero

2096 - Mertens function zero

2097 - Mertens function zero

2099 - Mertens function zero, safe prime

2100 - Mertens function zero

2109 - square pyramidal number

2113 - Mertens function zero

2116 = 46^2

2117 - Mertens function zero

2119 - Mertens function zero

2120 - Mertens function zero

2122 - Mertens function zero

2125 - nonagonal number

2127 - sum of the first 34 primes

2129 - Sophie Germain prime

2135 - Mertens function zero

2136 - Mertens function zero

2138 - Mertens function zero

2141 - Sophie Germain prime

2145 - triangular number

2162 - pronic number

2171 - Mertens function zero

2172 - Mertens function zero

2176 - pentagonal pyramidal number, centered pentagonal number

2179 - Wedderburn-Etherington number

2187 - vampire number, 3^7

2188 - Motzkin number

2197 = 13^3

2205 - odd abundant number

2207 - safe prime

2208 - Keith number

2209 = 47^2

2211 - triangular number

2223 - Kaprekar number

2232 - decagonal number

2255 - octahedral number

2256 - pronic number

2269 - cuban prime

2273 - Sophie Germain prime

2276 - sum of the first 35 primes

2278 - triangular number

2294 - Mertens function zero

2295 - Mertens function zero

2296 - Mertens function zero

2300 - tetrahedral number

2301 - nonagonal number

2304 = 48^2

2306 - Mertens function zero

2309 - primorial prime, Mertens function zero

2310 - 5th primorial

2311 - primorial prime

2321 - Mertens function zero

2322 - Mertens function zero

2326 - centered pentagonal number

2331 - centered cube number

2338 - Mertens function zero

2339 - Sophie Germain prime

2346 - triangular number

2351 - Sophie Germain prime

2352 - pronic number

2357 - Smarandache-Wellin prime

2393 - Sophie Germain prime

2397 - sum of the squares of the first ten primes

2399 - Sophie Germain prime

2401 = 7^4 = 49^2

2415 - triangular number

2425 - decagonal number

2427 - sum of the first 36 primes

2437 - cuban prime

2447 - safe prime

2450 - pronic number

2459 - Sophie Germain prime, safe prime

2465 - magic constant of n×n magic square and n-Queens Problem for n = 17, Carmichael number

2470 - square pyramidal number

2481 - centered pentagonal number

2484 - nonagonal number

2485 - triangular number

2500 = 50^2

2501 - Mertens function zero

2502 - Mertens function zero

2517 - Mertens function zero

2520 - highly composite number

2522 - Mertens function zero

2523 - Mertens function zero

2524 - Mertens function zero

2525 - Mertens function zero

2530 - Mertens function zero

2533 - Mertens function zero

2537 - Mertens function zero

2538 - Mertens function zero

2543 - Sophie Germain prime

2549 - Sophie Germain prime

2550 - pronic number

2556 - triangular number

2567 - Mertens function zero

2568 - Mertens function zero

2570 - Mertens function zero

2579 - safe prime

2580 - Keith number

2584 - Fibonacci number, sum of the first 37 primes

2600 - tetrahedral number

2601 = 51^2

2620 - amicable number with 2924

2626 - decagonal number

2628 - triangular number

2641 - centered pentagonal number

2652 - pronic number

2674 - nonagonal number

2680 - number of 11-Queens Problem solutions

2689 - Mertens function zero

2693 - Sophie Germain prime

2699 - Sophie Germain prime

2701 - triangular number, super-Poulet number

2704 = 52^2

2728 - Kaprekar number

2736 - octahedral number

2741 - Sophie Germain prime

2744 = 14^3

2747 - sum of the first 38 primes

2753 - Sophie Germain prime

2756 - pronic number

2775 - triangular number

2791 - cuban prime

2806 - centered pentagonal number

2809 = 53^2

2819 - Sophie Germain prime, safe prime

2821 - Carmichael number

2835 - odd abundant number, decagonal number

2850 - triangular number

2862 - pronic number

2870 - square pyramidal number

2871 - nonagonal number

2872 - tetranacci number

2879 - safe prime

2903 - Sophie Germain prime, safe prime

2914 - sum of the first 39 primes

2916 = 54^2

2924 - amicable number with 2620

2925 - magic constant of n×n magic square and n-Queens Problem for n = 18, tetrahedral number

2926 - triangular number

2939 - Sophie Germain prime

2963 - Sophie Germain prime

2965 - greater of 2nd pair of Smith brothers

2969 - Sophie Germain prime

2970 - harmonic divisor number, pronic number

2976 - centered pentagonal number

2997 - chiliagonal number