OFFSET
1,1
COMMENTS
If a term is a perfect square, then its square root must be in A001542. The first few such terms are the squares of 2, 2378, 93222358, 165326326037771920630... - Ivan Neretin, May 25 2016
LINKS
Ivan Neretin, Table of n, a(n) for n = 1..10014
MATHEMATICA
Select[Range[300], DivisorSigma[0, #] == DivisorSigma[0, 2 # + 1] &] (* Ivan Neretin, May 25 2016 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Sep 08 2002
STATUS
approved