

A138862


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


4



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
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OFFSET

1,1


LINKS

Table of n, a(n) for n=1..47.
L. C. Noll, Mersenne Prime Digits and Names.


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 *)


CROSSREFS

Cf. A000668, A080173, A138863, A138864, A138865, A138866.
Sequence in context: A110505 A009128 A053648 * A080173 A023266 A217198
Adjacent sequences: A138859 A138860 A138861 * A138863 A138864 A138865


KEYWORD

base,nonn


AUTHOR

Omar E. Pol, Apr 02 2008


EXTENSIONS

a(40)a(47) from Ivan Panchenko, Aug 03 2018
Definition clarified by Harvey P. Dale, Aug 01 2020


STATUS

approved



