OFFSET
1,2
LINKS
Indranil Ghosh, Table of n, a(n) for n = 1..10000
FORMULA
a(n) = mod(A000203(n), 30).
MATHEMATICA
Table[Mod[DivisorSigma[1, n], 30], {n, 120}] (* Michael De Vlieger, Jan 10 2017 *)
PROG
(PARI) a(n) = sigma(n) % 30; \\ Michel Marcus, Dec 19 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Aug 19 2004
STATUS
approved