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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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4
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OFFSET
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1,2
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REFERENCES
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Joe Roberts, Lure of the Integers, page 245 (entry for 645).
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LINKS
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EXAMPLE
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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
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KEYWORD
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fini,full,nonn
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AUTHOR
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STATUS
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approved
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