OFFSET
1,2
COMMENTS
No more terms < 10^16. - David Wasserman, Apr 05 2005
2^63 < a(23) <= 14612920781245825506. - Donovan Johnson, Apr 24 2011
PROG
(PARI) isTriang(n) = local(x); x = sqrtint(2*n); n == x*(x + 1)/2;
i = 1; n = 1; print1(n, ", "); while(1, i++; n += i; f = factor(n); if (isTriang(n/f[1, 1]), print1(n, ", "))); \\ David Wasserman, Apr 05 2005
CROSSREFS
KEYWORD
nonn
AUTHOR
Jason Earls, Nov 01 2002
EXTENSIONS
More terms from David Wasserman, Apr 05 2005
a(20)-a(22) from Donovan Johnson, Apr 24 2011
STATUS
approved