A169685 - OEIS

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

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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

Index entries for linear recurrences with constant coefficients, signature (1).

EXAMPLE

686479766013060971498190079908139321726943530014330540939446345918\