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

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