A248936 Decimal expansion of 2^4423 - 1, the 20th Mersenne prime A000668(20).

2, 8, 5, 5, 4, 2, 5, 4, 2, 2, 2, 8, 2, 7, 9, 6, 1, 3, 9, 0, 1, 5, 6, 3, 5, 6, 6, 1, 0, 2, 1, 6, 4, 0, 0, 8, 3, 2, 6, 1, 6, 4, 2, 3, 8, 6, 4, 4, 7, 0, 2, 8, 8, 9, 1, 9, 9, 2, 4, 7, 4, 5, 6, 6, 0, 2, 2, 8, 4, 4, 0, 0, 3, 9, 0, 6, 0, 0, 6, 5, 3, 8, 7, 5, 9, 5, 4, 5, 7, 1, 5, 0, 5, 5, 3, 9, 8, 4, 3, 2, 3, 9, 7, 5, 4

Offset: 1332

Author

Arkadiusz Wesolowski, Oct 17 2014

Keywords

• nonn
• cons
• easy
• fini
• full

Comments

The 19th Mersenne prime and this prime were found in 1961 by Alexander Hurwitz, using IBM 7090.

Examples

			28554254222827961390156356610216400832616423864470288919924745660228440...
		

Links

• Arkadiusz Wesolowski, Table of n, a(n) for n = 1332..2663
• Alexander Hurwitz, New Mersenne Primes, Mathematics of Computation, vol. 16, No. 78 (1962), pp. 249-251.
• Wikipedia, Mersenne prime

Crossrefs

Cf. A169684 = A000668(11), A169681 = A000668(12), A169685 = A000668(13), A204063 = A000668(14), A248931 = A000668(15), A248932 = A000668(16), A248933 = A000668(17), A248934 = A000668(18), A248935 = A000668(19).

Programs

Magma

Reverse(Intseq(2^4423-1));

Mathematica

RealDigits[2^4423 - 1, 10, 100][[1]] (* G. C. Greubel, Oct 03 2017 *)

PARI

eval(Vec(Str(2^4423-1)))

Formula

Equals 2^A000043(20) - 1.