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A320112
a(n) = Product_{d|n, d>1} prime(1+(d mod 12)).
3
1, 5, 7, 55, 13, 595, 19, 1265, 203, 2015, 37, 13090, 3, 475, 637, 13915, 13, 293335, 19, 509795, 3857, 5735, 37, 602140, 39, 75, 1421, 57475, 13, 28534415, 19, 320045, 7511, 2015, 9139, 12906740, 3, 475, 147, 128978135, 13, 27866825, 19, 1450955, 535717, 5735, 37, 13247080, 57, 30225, 637, 9075, 13, 34906865, 9139, 30404275, 3857, 2015, 37
OFFSET
1,2
LINKS
FORMULA
a(n) = Product_{d|n, d>1} prime(1+(d mod 12)).
PROG
(PARI) A320112(n) = { my(m=1); fordiv(n, d, if(d>1, m *= prime(1+(d%12)))); (m); };
CROSSREFS
Cf. A320113 (rgs-transform).
Sequence in context: A376613 A320116 A320108 * A284380 A082714 A300090
KEYWORD
nonn
AUTHOR
Antti Karttunen, Oct 06 2018
STATUS
approved