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A053612
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Numbers such that 1+2+3...+a(n) = 1+4+9+...+r^2, for some r.
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3
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OFFSET
| 1,2
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REFERENCES
| Joe Roberts, Lure of the Integers, page 245 (entry for 645).
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LINKS
| R. Finkelstein, H. London, On triangular numbers which are sums of consecutive squares, J. Number Theory 4 (1972) 455-462
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EXAMPLE
| 1^2+2^2+3^2+4^2+5^2 = 1+2+3+...+10, so 10 is in the sequence.
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CROSSREFS
| Cf. A039596, A053611.
Sequence in context: A164766 A075828 A153584 * A072146 A074674 A164936
Adjacent sequences: A053609 A053610 A053611 * A053613 A053614 A053615
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KEYWORD
| fini,full,nonn
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AUTHOR
| Jud McCranie (JudMcCranie(AT)ugaalum.uga.edu), Mar 19 2000
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