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Search: id:A161557
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| 1, 744, 393768, 64481280, 3457199880, 101229281280, 1999215843600, 29764163100672
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OFFSET
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-1,2
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COMMENT
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[Mathworld]: "Lehmer(1942) showed that (n+1)*C(n) == 0 mod 24 for n=/> 1" Cf. A161395: (0, 31, 16407, 2686720, 144049995,...) = ((n+1)*A000521(n)) / 24
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FORMULA
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a(n) = (n+1)*A000521(n), n>(-1)
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EXAMPLE
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a(2) = 64481280 = 3*A000521(2) = 3*21493760; such that 64481280 == 0 mod 24, where 64481280 / 24 = 2686720 = A161395(2)
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CROSSREFS
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Cf. A000521, A161395
Sequence in context: A119595 A000521 A066395 this_sequence A091406 A066396 A099819
Adjacent sequences: A161554 A161555 A161556 this_sequence A161558 A161559 A161560
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KEYWORD
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nonn
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AUTHOR
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Gary W. Adamson & Alexander Povolotsky (qntmpkt(AT)yahoo.com), Jun 13 2009
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