OFFSET
1,2
LINKS
Harry J. Smith, Table of n, a(n) for n = 1..1000
FORMULA
Empirical g.f.: -x*(x^3-x^2-x-1) / ((x-1)^4*(x^2+x+1)^2). [Colin Barker, Jan 12 2013]
PROG
(PARI) { n=0; a=0; for (m=1, 10^9, if (m%floor(sqrt(m)) == 0, a+=m; write("b066377.txt", n++, " ", a); if (n==1000, return)) ) } \\ Harry J. Smith, Feb 12 2010
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Dec 23 2001
STATUS
approved