id:A080824 - OEIS Search Results

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

+0
3

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 (list; graph; listen)

	OFFSET	`1,1`
	PROGRAM	`(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(2u)): if(v(v+1)/2==u, print1(v", "):p=k:break)))`
	CROSSREFS	`Cf. A072522.` `Sequence in context: A020716 A020937 A048586 this_sequence A100602 A026601 A109138` `Adjacent sequences: A080821 A080822 A080823 this_sequence A080825 A080826 A080827`
	KEYWORD	`nonn`
	AUTHOR	`Ralf Stephan (ralf(AT)ark.in-berlin.de), Mar 27 2003`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

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