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Search: id:A003556
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| A003556 |
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Both square and tetrahedral. |
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+0
1
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OFFSET
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1,3
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REFERENCES
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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
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Select[Rest[FoldList[Plus, 0, Rest[FoldList[Plus, 0, Range[50000]]]]], IntegerQ[Sqrt[ # ]]&]
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CROSSREFS
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Adjacent sequences: A003553 A003554 A003555 this_sequence A003557 A003558 A003559
Sequence in context: A152840 A003832 A070157 this_sequence A053015 A089210 A034014
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KEYWORD
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nonn,fini,full,bref
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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