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A060204
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Square pyramorphic numbers: suppose the k-th square pyramidal number S(k) (A000330) ends in k; sequence gives value of S(k).
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1
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1, 55, 5525, 22140, 93665, 173880, 1378160, 3822225, 19096385, 21413400, 58695560, 81575625, 161553785, 170986800, 295372960, 555371185, 5595682560, 6032742625, 21341334000, 46478345185, 94121656560, 96947076625
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OFFSET
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1,2
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REFERENCES
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C. Pickover, Wonders of Numbers, Oxford University Press, NY, 2001, pp. 158-160.
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LINKS
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C. A. Pickover, "Wonders of Numbers, Adventures in Mathematics, Mind and Meaning," Zentralblatt review
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EXAMPLE
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55 is square pyramorphic because it is the 5th square pyramidal number and ends in 5. 173880 is square pyramorphic because it is the 80th square pyramidal number and ends in 80.
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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