A320116 a(n) = Product_{d|n, d>1} prime(1+(d mod 6)).

1, 5, 7, 55, 13, 70, 3, 275, 49, 715, 13, 1540, 3, 75, 637, 3025, 13, 980, 3, 39325, 147, 715, 13, 15400, 39, 75, 343, 9075, 13, 140140, 3, 15125, 637, 715, 507, 43120, 3, 75, 147, 2162875, 13, 14700, 3, 39325, 31213, 715, 13, 338800, 9, 10725, 637, 9075, 13, 13720, 507, 226875, 147, 715, 13, 30830800, 3, 75, 7203, 166375, 507, 140140, 3

Offset

1,2

Links

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

Formula

a(n) = Product_{d|n, d>1} prime(1+(d mod 6)).

Prog

(PARI) A320116(n) = { my(m=1); fordiv(n, d, if(d>1, m *= prime(1+(d%6)))); (m); };

Crossrefs

Cf. A320114, A320117 (rgs-transform),

Cf. also A319986.

Sequence in context: A367572 A180552 A168545 * A320108 A320112 A284380

Adjacent sequences: A320113 A320114 A320115 * A320117 A320118 A320119

Keyword

nonn

Author

Antti Karttunen, Oct 06 2018

Status

approved