A126050 Exponents p of the Mersenne primes 2^p - 1 (see A000043) read mod 10.

2, 3, 5, 7, 3, 7, 9, 1, 1, 9, 7, 7, 1, 7, 9, 3, 1, 7, 3, 3, 9, 1, 3, 7, 1, 9, 7, 3, 3, 9, 1, 9, 3, 7, 9, 1, 7, 3, 7, 1, 3, 1, 7, 7, 7, 1, 9

Offset

1,1

Links

Table of n, a(n) for n=1..47.

Formula

a(n) = A010879(A000043(n)). - Ivan Panchenko, Apr 07 2018

Mathematica

Array[Mod[MersennePrimeExponent@ #, 10] &, 45] (* Michael De Vlieger, Apr 10 2018 *)

Crossrefs

Cf. A126043-A126059.

Sequence in context: A239695 A073034 A239037 * A163821 A156294 A126607

Adjacent sequences: A126047 A126048 A126049 * A126051 A126052 A126053

Keyword

nonn,more

Author

Artur Jasinski, Dec 17 2006

Extensions

a(45)-a(46) from Ivan Panchenko, Apr 07 2018

a(47) from Ivan Panchenko, Apr 09 2018

Status

approved