A320114 a(n) = Product_{d|n, d>1} prime(1+(d mod 4)).

1, 5, 7, 10, 3, 175, 7, 20, 21, 75, 7, 700, 3, 175, 147, 40, 3, 2625, 7, 300, 147, 175, 7, 2800, 9, 75, 147, 700, 3, 91875, 7, 80, 147, 75, 147, 21000, 3, 175, 147, 1200, 3, 91875, 7, 700, 1323, 175, 7, 11200, 21, 1125, 147, 300, 3, 91875, 147, 2800, 147, 75, 7, 1470000, 3, 175, 3087, 160, 27, 91875, 7, 300, 147, 91875, 7, 168000, 3, 75

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 4)).

Prog

(PARI) A320114(n) = { my(m=1); fordiv(n, d, if(d>1, m *= prime(1+(d%4)))); (m); };

Crossrefs

Cf. A320115 (rgs-transform), A320116.

Cf. also A319984.

Cf. A002144 (a(n)=3), A002145 (a(n)=7).

Sequence in context: A366312 A323004 A264349 * A364284 A059485 A028786

Adjacent sequences: A320111 A320112 A320113 * A320115 A320116 A320117

Keyword

nonn

Author

Antti Karttunen, Oct 06 2018

Status

approved