login
A320116
a(n) = Product_{d|n, d>1} prime(1+(d mod 6)).
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
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: A180552 A168545 A376613 * A320108 A320112 A284380
KEYWORD
nonn
AUTHOR
Antti Karttunen, Oct 06 2018
STATUS
approved