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A025545 a(n) = (1/4 + 1/6 + ... + 1/c(n))*LCM{4, 6, ..., c(n)}, where c(n) = n-th composite number. 0
1, 5, 13, 47, 271, 301, 2287, 2455, 5225, 5505, 5757, 5997, 68487, 70797, 365073, 4884549, 15054047, 15440147, 15800507, 32276689, 32931889, 570652913, 581154833, 591365033, 11419719227, 11598790427, 11773384847, 11939665247, 12098387447, 12253582487 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..30.

CROSSREFS

Sequence in context: A120790 A162563 A250133 * A146152 A082132 A220900

Adjacent sequences:  A025542 A025543 A025544 * A025546 A025547 A025548

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified July 19 04:25 EDT 2019. Contains 325144 sequences. (Running on oeis4.)