login
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
OFFSET
1,2
PROG
(PARI) forstep(m=1, 10^6, 2, n=sqrtint(2^m-1); if(2^m-1-n^2<n, print1(m, ", ")))
CROSSREFS
KEYWORD
nonn
AUTHOR
Reikku Kulon, Sep 25 2008
EXTENSIONS
Edited and extended by Max Alekseyev, Oct 12 2009
STATUS
approved