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

1332,1

Comments

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

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

Formula

Equals 2^A000043(20) - 1.

Example

28554254222827961390156356610216400832616423864470288919924745660228440...

Mathematica

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

Prog

(Magma) Reverse(Intseq(2^4423-1));
(PARI) eval(Vec(Str(2^4423-1)))

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).

Sequence in context: A155808 A052240 A035490 * A019678 A115319 A351457

Adjacent sequences: A248933 A248934 A248935 * A248937 A248938 A248939

Keyword

nonn,cons,easy,fini,full

Author

Arkadiusz Wesolowski, Oct 17 2014

Status

approved