A087189 - OEIS

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A087189

(P(p)-1)/2/p^2 where p runs through the odd primes different from 5 and P(k) is the k-th central pentanomial coefficient (A005191).

1, 83, 16907, 279021, 89444018, 1695011087, 658067703933, 5768410509553937, 122108313460051500, 1226978854222034501448, 593538703869555995238872, 13175226571428140572866093, 6594852118968926152838341468 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	LINKS	`M. F. Hasler, Table of n, a(n) for n = 1..100`
	PROG	`(PARI) A087189(n) = local(p=prime(n+2-(n==1))); (A005191(p)-1)/2/p^2 \\ - M. F. Hasler`
	CROSSREFS	`Sequence in context: A180846 A097839 A268987 * A201727 A116263 A287686` `Adjacent sequences: A087186 A087187 A087188 * A087190 A087191 A087192`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre, Oct 19 2003`
	EXTENSIONS	`Corrected and extended by M. F. Hasler, Jul 23 2007`
	STATUS	`approved`

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Last modified December 4 08:33 EST 2023. Contains 367558 sequences. (Running on oeis4.)