A069792 Triangular numbers in A062918.

1, 3, 6, 10, 15, 21, 28, 36, 45, 78, 3741, 4005, 4278, 14028, 224115, 238395, 258121, 994755, 1104841, 2440945, 4601061, 19185915, 26451901, 27073761, 38250631, 611712753, 1787631321, 3620877351, 4427640253, 16786524835, 60302220121, 65003739895, 226236074130, 367188935361, 6710200324191

Offset: 1

Author

Amarnath Murthy, Apr 09 2002

Keywords

• base
• nonn

Crossrefs

Cf. A062918.

Programs

PARI

rev(n) = eval(concat(Vecrev(Str(n))));
lista(nn) = {s = 0; for (n=1, nn, s += rev(n); if (ispolygonal(s, 3), print1(s, ", ")););} \\ Michel Marcus, Sep 15 2015

Extensions

More terms from Jason Earls, May 16 2002

More terms from Michel Marcus, Sep 15 2015