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A081765 Numbers n such that (n+2) divides 2^(n-1)-1. 5
1, 7, 13, 19, 31, 37, 49, 55, 61, 67, 85, 91, 109, 121, 127, 139, 157, 175, 181, 193, 199, 211, 217, 235, 247, 265, 289, 301, 307, 313, 319, 325, 337, 379, 391, 397, 409, 415, 445, 451, 469, 487, 499, 517, 535, 541, 571, 577, 589, 595, 631, 667, 679, 685, 691 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Is a(n)/n/log(n)/log(log(n)) bounded ?

LINKS

Table of n, a(n) for n=1..55.

CROSSREFS

Sequence in context: A038160 A106870 A040038 * A257002 A216567 A091180

Adjacent sequences:  A081762 A081763 A081764 * A081766 A081767 A081768

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, Apr 09 2003

STATUS

approved

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Last modified October 16 15:31 EDT 2019. Contains 328101 sequences. (Running on oeis4.)