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Search: id:A136374
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| 3, 4, 2, 1, 3, 1224, 551, 1, 697, 66, 60, 31, 12, 7
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OFFSET
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2,1
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COMMENT
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Conjecture: p = Prime[n] divides (A128677(n) - 1)/2.
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FORMULA
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a(n) = ((A128677(n) - 1)/2)/Prime[n].
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EXAMPLE
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A128677(n) begins {19, 41, 29, 23, 79, 41617, ...}.
Thus
a(2) = (19 - 1)/2/Prime[2] = 18/2/3 = 3,
a(3) = (41 - 1)/2/Prime[3] = 40/2/5 = 4,
a(7) = (41617 - 1)/2/Prime[7] = 41616/2/17 = 1224.
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CROSSREFS
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Cf. A128677 = Least k>p such that (kp)^3 divides (p-1)^(kp)^2+1, where p = Prime[n]>2. Cf. A127263 = numbers n such that n^3 divide 2^(n^2)+1. Cf. A128678, A128679, A128680, A128681, A128682, A128683, A128684, A128685.
Sequence in context: A105825 A145425 A070352 this_sequence A081246 A096411 A143486
Adjacent sequences: A136371 A136372 A136373 this_sequence A136375 A136376 A136377
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KEYWORD
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more,nonn
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AUTHOR
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Alexander Adamchuk (alex(AT)kolmogorov.com), Dec 27 2007
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