OFFSET
1,2
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..4480
EXAMPLE
324 is in the sequence because it is a perfect square (18^2=324) as well as an Ulam number (A002858).
CROSSREFS
KEYWORD
nonn
AUTHOR
Shyam Sunder Gupta, Feb 20 2010
EXTENSIONS
More terms from Amiram Eldar, Aug 22 2020
STATUS
approved