The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A320114 a(n) = Product_{d|n, d>1} prime(1+(d mod 4)). 6
 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 (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 4)). MAPLE with(numtheory): P:=proc(n) local a, d; a:=divisors(n) minus {1}; mul(ithprime(1+(d mod 4)), d=a); end: seq(P(i), i=1..74); # Paolo P. Lava, Oct 11 2018 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: A050888 A323004 A264349 * A059485 A028786 A282391 Adjacent sequences:  A320111 A320112 A320113 * A320115 A320116 A320117 KEYWORD nonn AUTHOR Antti Karttunen, Oct 06 2018 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified June 17 16:49 EDT 2021. Contains 345085 sequences. (Running on oeis4.)