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A087965 -1+2^n is divisible by (n-1). 1
2, 4, 16, 36, 120, 256, 456, 1296, 2556, 2704, 3816, 3856, 4356, 5544, 6480, 8008, 9216, 10440, 10620, 11952, 16212, 22896, 23436, 26320, 26796, 27840, 28680, 35208, 43056, 44100, 47520, 47880, 49680, 51120, 57240, 61920, 62568, 63168, 63936 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..39.

FORMULA

Solutions to Mod[ -1+2^x, x-1]=0.

CROSSREFS

Cf. A006521.

Sequence in context: A053038 A001088 A101926 * A074411 A189838 A247219

Adjacent sequences:  A087962 A087963 A087964 * A087966 A087967 A087968

KEYWORD

nonn

AUTHOR

Labos Elemer, Sep 22 2003

STATUS

approved

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Last modified January 21 05:39 EST 2020. Contains 331104 sequences. (Running on oeis4.)