A305812 a(1) = 0; for n > 1, a(n) = Product_{d|n, 1 < d < n} prime(A305788(d)-1).

0, 1, 1, 2, 1, 4, 1, 6, 2, 6, 1, 60, 1, 4, 6, 42, 1, 100, 1, 198, 4, 4, 1, 4620, 3, 4, 10, 60, 1, 4620, 1, 546, 4, 26, 6, 56100, 1, 4, 4, 26334, 1, 600, 1, 60, 210, 10, 1, 1381380, 2, 132, 26, 60, 1, 18700, 6, 4620, 4, 10, 1, 66625020, 1, 4, 60, 15834, 6, 1000, 1, 2418, 10, 3300, 1, 334187700, 1, 4, 84, 60, 4, 2200, 1, 14036022, 110, 4, 1

Offset

1,4

Links

Antti Karttunen, Table of n, a(n) for n = 1..8192

Index entries for sequences operating on GF(2)[X]-polynomials

Formula

a(1) = 0; for n > 1, a(n) = Product_{d|n, d<n} A008578(A305788(d)).

Prog

(PARI) A305812(n) = if(1==n, 0, my(m=1); fordiv(n, d, if((d>1)&&(d<n), m *= prime(A305788(d)-1))); (m)); \\ Needs also code from A305788.

Crossrefs

Cf. A008578, A278233, A305788, A305813 (rgs-transform), A305814.

Cf. also A305792, A304102.

Sequence in context: A138009 A131755 A375277 * A341857 A292403 A271773

Adjacent sequences: A305809 A305810 A305811 * A305813 A305814 A305815

Keyword

nonn

Author

Antti Karttunen, Jun 11 2018

Status

approved