A080824 Numbers n such that T(n)=T(A072522(n))+T(A072522(n+1)), T(i) being the triangular numbers.

6, 8, 11, 16, 46, 73, 856, 1238, 1493, 1731, 1931, 2193, 2713, 3238, 4006, 4648, 4781, 5534, 6240, 6458, 7793, 9039, 9491, 11456, 13290, 16041, 21388, 24439, 25449, 30327, 34682, 35837, 38153, 47071, 358732, 536644, 581296, 701563

Offset: 1

Author

Ralf Stephan, Mar 27 2003

Keywords

• nonn

Links

• Chai Wah Wu, Table of n, a(n) for n = 1..2400

Crossrefs

Cf. A072522.

Programs

PARI

p=3; for(n=2, 50, t=p*(p+1)/2; for(k=p, 10^9, u=t+k*(k+1)/2; v=floor(sqrt(2*u));  if(v*(v+1)/2==u, print1(v", "); p=k; break)))