A275977 Decimal expansion of 2^9689 - 1, the 21st Mersenne prime A000668(21).

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

Offset: 2917

Author

Arkadiusz Wesolowski, Aug 15 2016

Keywords

• nonn
• cons
• easy
• fini
• full

Examples

			47822027880546120295283929866000590974149717240223650085133451099183789...
		

Links

• Arkadiusz Wesolowski, Table of n, a(n) for n = 2917..5833
• Wikipedia, Mersenne prime

Crossrefs

Cf. A169684 = A000668(11), A169681 = A000668(12), A169685 = A000668(13), A204063 = A000668(14), A248931 = A000668(15), A248932 = A000688(16), A248933 = A000668(17), A248934 = A000668(18), A248935 = A000668(19), A248936 = A000668(20), A275979 = A000668(22), A275980 = A000668(23), A275981 = A000668(24), A275982 = A000668(25), A275983 = A000668(26), A275984 = A000668(27).

Programs

Magma

Reverse(Intseq(2^9689-1))[1..105];

Mathematica

First@RealDigits@N[2^9689 - 1, 100] (* G. C. Greubel, Aug 15 2016 *)
RealDigits[2^MersennePrimeExponent[21]-1,10,120][[1]] (* Harvey P. Dale, Aug 14 2025 *)

PARI

eval(Vec(Str(2^9689-1)))[1..105]

Formula

2^A000043(21) - 1.