OFFSET
1,2
LINKS
Ivan Neretin, Table of n, a(n) for n = 1..10000
MATHEMATICA
Select[Range[150], OddQ@Quotient[#^2, DivisorSigma[0, #^2]] &] (* Ivan Neretin, Mar 23 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
John W. Layman, Jun 12 2009
STATUS
approved