OFFSET
2,1
LINKS
Seiichi Manyama, Table of n, a(n) for n = 2..1000
Eric Weisstein's World of Mathematics, Totient Function.
Wikipedia, Euler's totient function.
MATHEMATICA
Table[EulerPhi[n^5-1]/5, {n, 2, 40}] (* Harvey P. Dale, Feb 09 2019 *)
PROG
(PARI) {a(n) = eulerphi(n^5-1)/5}
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Sep 13 2018
STATUS
approved