A138862 First two (i.e., the two most significant) digits of n-th Mersenne prime A000668(n).

3, 7, 31, 12, 81, 13, 52, 21, 23, 61, 16, 17, 68, 53, 10, 14, 44, 25, 19, 28, 47, 34, 28, 43, 44, 40, 85, 53, 52, 51, 74, 17, 12, 41, 81, 62, 12, 43, 92, 12, 29, 12, 31, 12, 20, 16, 31

Offset: 1

Author

Omar E. Pol, Apr 02 2008

Keywords

• base
• nonn

Links

• L. C. Noll, Mersenne Prime Digits and Names.

Crossrefs

Cf. A000668, A080173, A138863, A138864, A138865, A138866.

Programs

Mathematica

Join[{3,7},FromDigits[Take[IntegerDigits[#],2]]&/@ (2^MersennePrimeExponent[ Range[ 3,47]]-1)] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Aug 01 2020 *)

Extensions

a(40)-a(47) from Ivan Panchenko, Aug 03 2018

Definition clarified by Harvey P. Dale, Aug 01 2020