OFFSET
1,2
COMMENTS
Least m such that 5*n - 1 divides 5^m - 1.
LINKS
Arkadiusz Wesolowski, Table of n, a(n) for n = 1..10000
Eric Weisstein's World of Mathematics, Multiplicative Order
MATHEMATICA
Table[MultiplicativeOrder[5, 5*n - 1], {n, 67}]
PROG
(PARI) vector(80, n, znorder(Mod(5, 5*n-1))) \\ Michel Marcus, Feb 09 2015
(GAP) List([1..70], n->OrderMod(5, 5*n-1)); # Muniru A Asiru, Feb 25 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
Arkadiusz Wesolowski, Nov 16 2012
STATUS
approved