OFFSET
1,2
COMMENTS
Apart from 1, numbers of the form x*y^2 for y >= 2, where x is squarefree and is either y^2-2 or y^2-1. - Robert Israel, Apr 11 2019
LINKS
Robert Israel, Table of n, a(n) for n = 1..10000
MAPLE
select(numtheory:-issqrfree, [1, seq(seq(b^2+j, j=-2..-1), b=2..100)]); # Robert Israel, Apr 11 2019
PROG
(PARI) isok(n) = core(n) == sqrtint(n); \\ Michel Marcus, Apr 12 2019
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Benoit Cloitre, Apr 14 2002
EXTENSIONS
Name edited by Robert Israel, Apr 12 2019
STATUS
approved