OFFSET
1,4
COMMENTS
The 0 terms identify the prime numbers.
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..65537
FORMULA
MATHEMATICA
Table[(MoebiusMu[k] + (DivisorSigma[1, k] - k)), {k, 200} ]
PROG
(PARI) vector(100, n, moebius(n) + sigma(n) - n) \\ Michel Marcus, Jan 31 2015
CROSSREFS
KEYWORD
nonn
AUTHOR
Ke Xiao, Jan 13 2015
STATUS
approved