login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A138862 First two (i.e., the two most significant) digits of n-th 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 (list; graph; refs; listen; history; text; internal format)
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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 27 01:02 EDT 2020. Contains 338035 sequences. (Running on oeis4.)