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A292199 Numbers m such that there is a prime divisor p > m of 2^m - 1 not of the form k*m + 1. 2
20, 25, 27, 28, 33, 35, 44, 45, 48, 49, 52, 54, 55, 56, 60, 63, 66, 68, 69, 70, 72, 76, 77, 80, 81, 84, 87, 88, 90, 91, 92, 95, 96, 98, 99, 100, 102, 104, 105, 108, 110, 112, 116, 117, 119, 120, 123, 124, 125, 126, 129, 132, 135, 136, 138, 140, 141, 143, 144, 145, 147, 148, 150 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Contains no primes q and no doubled primes 2q.

Are there infinitely many such numbers?

LINKS

Max Alekseyev, Table of n, a(n) for n = 1..829

CROSSREFS

Cf. A000040, A000225, A060443, A292188.

Contains A291855.

Sequence in context: A112819 A070684 A295152 * A269308 A167306 A061840

Adjacent sequences:  A292196 A292197 A292198 * A292200 A292201 A292202

KEYWORD

nonn

AUTHOR

Thomas Ordowski, Sep 11 2017

EXTENSIONS

Terms a(19) onward from Max Alekseyev, Sep 13 2017

STATUS

approved

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Last modified July 29 05:20 EDT 2021. Contains 346340 sequences. (Running on oeis4.)