A169685 Decimal expansion of 2^521 - 1.

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

Offset

157,1

Comments

The 13th Mersenne prime, A000668(13); 521 = A000043(13). - M. F. Hasler, Jan 09 2013

Links

Arkadiusz Wesolowski, Table of n, a(n) for n = 157..313

D. H. Lehmer, Recent Discoveries of Large Primes, Mathematics of Computation, vol. 6, No. 37 (1952), p. 61.

Wikipedia, Mersenne prime

Example

686479766013060971498190079908139321726943530014330540939446345918\
554318339765605212255964066145455497729631139148085803712198799971\
6643812574028291115057151.

Mathematica

IntegerDigits[2^521-1] (* Paolo Xausa, Oct 07 2023 *)

Prog

(Magma) Reverse(Intseq(2^521-1)); // Arkadiusz Wesolowski, Oct 18 2014

Crossrefs

Cf. A169684 = A000668(11), A169681 = A000668(12), A204063 = A000668(14), A248931 = A000668(15), A248932 = A000668(16), A248933 = A000668(17), A248934 = A000668(18), A248935 = A000668(19), A248936 = A000668(20).

Sequence in context: A340725 A021597 A331941 * A339606 A360928 A200326

Adjacent sequences: A169682 A169683 A169684 * A169686 A169687 A169688

Keyword

nonn,cons,easy,fini,full

Author

N. J. A. Sloane, Apr 13 2010

Status

approved