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A144931 a(n) is the Mersenne number exponent for A144932(n). 3
1, 7, 11, 15, 17, 19, 21, 23, 27, 29, 39, 41, 47, 49, 55, 57, 73, 75, 83, 93, 95, 101, 103, 107, 109, 113, 115, 117, 119, 123, 125, 127, 131, 137, 139, 143, 155, 161, 163, 165, 169, 171, 177, 183, 185, 191, 199, 203, 207, 211, 213, 217, 221, 225, 237, 241, 243, 255, 257, 259 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..60.

PROG

(PARI) forstep(m=1, 10^6, 2, n=sqrtint(2^m-1); if(2^m-1-n^2<n, print1(m, ", ")))

CROSSREFS

Cf. A000225, A017910, A144932

Sequence in context: A120687 A194468 A053217 * A166257 A192992 A335652

Adjacent sequences:  A144928 A144929 A144930 * A144932 A144933 A144934

KEYWORD

nonn

AUTHOR

Reikku Kulon, Sep 25 2008

EXTENSIONS

Edited and extended by Max Alekseyev, Oct 12 2009

STATUS

approved

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Last modified October 26 05:46 EDT 2021. Contains 348256 sequences. (Running on oeis4.)