OFFSET
1,12
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..11880
Antti Karttunen, Data supplement: n, a(n) computed for n = 1..100000
MAPLE
PROG
(PARI) A153011(n) = (2+eulerphi(n)+sigma(n)-numdiv(n)-(2*n)); \\ Antti Karttunen, Oct 08 2018
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Omar E. Pol, Dec 23 2008
EXTENSIONS
More terms from R. J. Mathar, Feb 19 2009
STATUS
approved