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A097407 a(n) = (A097406(n) - 1)/n. 3
0, 1, 2, 1, 6, 0, 18, 2, 8, 1, 8, 1, 630, 3, 10, 16, 7710, 1, 27594, 2, 16, 31, 7760, 10, 72, 105, 9728, 4, 72, 11, 69273666, 2048, 18166, 1285, 3512, 3, 16657248, 4599, 3112, 1542, 4012472, 129, 48834, 48, 518, 60787, 282224, 14, 90462791808, 81, 218, 31 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
LINKS
S. S. Wagstaff, Jr., The Cunningham Project, Factorizations of 2^n-1, n odd, n<1200.
CROSSREFS
Sequence in context: A078503 A288052 A288505 * A060480 A208682 A094673
KEYWORD
nonn
AUTHOR
Marco Matosic, Aug 16 2004
EXTENSIONS
Edited by Vladeta Jovovic, Aug 26 2004
STATUS
approved

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Last modified April 18 06:24 EDT 2024. Contains 371769 sequences. (Running on oeis4.)