A248931 Decimal expansion of 2^1279 - 1, the 15th Mersenne prime A000668(15).

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

Offset: 386

Author

Arkadiusz Wesolowski, Oct 17 2014

Keywords

• nonn
• cons
• easy
• fini
• full

Comments

The 13th through the 17th Mersenne primes were found in 1952 by Raphael M. Robinson, using SWAC.

Examples

			10407932194664399081925240327364085538615262247266704805319112350403608...
		

Links

• Arkadiusz Wesolowski, Table of n, a(n) for n = 386..771
• D. H. Lehmer, A New Mersenne Prime, Mathematics of Computation, vol. 6, No. 39 (1952), p. 205.
• Wikipedia, Mersenne prime

Crossrefs

Cf. A169684 = A000668(11), A169681 = A000668(12), A169685 = A000668(13), A204063 = A000668(14), A248932 = A000668(16), A248933 = A000668(17), A248934 = A000668(18), A248935 = A000668(19), A248936 = A000668(20).

Programs

Magma

Reverse(Intseq(2^1279-1));

Mathematica

RealDigits[2^1279 - 1, 10, 100][[1]] (* G. C. Greubel, Oct 03 2017 *)

PARI

eval(Vec(Str(2^1279-1)))

Formula

Equals 2^A000043(15) - 1.