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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 (list; graph; refs; listen; history; text; internal format)
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: A123789 A180552 A168545 * A320108 A320112 A284380

Adjacent sequences:  A320113 A320114 A320115 * A320117 A320118 A320119

KEYWORD

nonn

AUTHOR

Antti Karttunen, Oct 06 2018

STATUS

approved

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Last modified June 18 20:45 EDT 2021. Contains 345121 sequences. (Running on oeis4.)