OFFSET
1,3
COMMENTS
Essentially the same as A050977. - R. J. Mathar, Oct 21 2012
FORMULA
a(n) = multiplicative order of 5 modulo floor((5*n-1)/4), for n >= 1. This modulus is A047201(n). - Wolfdieter Lang, Sep 30 2020
MATHEMATICA
MultiplicativeOrder[5, #] & /@ Select[ Range@ 100, GCD[5, #] == 1 &] (* Robert G. Wilson v, Apr 05 2011 *)
PROG
(PARI) lista(nn) = {for(n=1, nn, if (gcd(n, 5) == 1, print1(znorder(Mod(5, n)), ", ")); ); } \\ Michel Marcus, Feb 09 2015
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved