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A003556
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Both square and tetrahedral.
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0
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OFFSET
| 1,3
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REFERENCES
| D. Wells, The Penguin Dictionary of Curious and Interesting Numbers. Penguin Books, NY, 1986, 600.
D. Wells, The Penguin Dictionary of Curious and Interesting Numbers, p. 165 (Rev. ed. 1997).
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MATHEMATICA
| Select[Rest[FoldList[Plus, 0, Rest[FoldList[Plus, 0, Range[50000]]]]], IntegerQ[Sqrt[ # ]]&]
Intersection[Binomial[# + 2, 3]&/@Range[0, 10000], Range[0, 409000]^2] (* From Harvey P. Dale, Feb 01 2011 *)
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CROSSREFS
| Sequence in context: A003832 A162703 A070157 * A053015 A089210 A203037
Adjacent sequences: A003553 A003554 A003555 * A003557 A003558 A003559
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KEYWORD
| nonn,fini,full,bref
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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