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A060204
Square pyramorphic numbers: suppose the k-th square pyramidal number S(k) (A000330) ends in k; sequence gives value of S(k).
1
1, 55, 5525, 22140, 93665, 173880, 1378160, 3822225, 19096385, 21413400, 58695560, 81575625, 161553785, 170986800, 295372960, 555371185, 5595682560, 6032742625, 21341334000, 46478345185, 94121656560, 96947076625
OFFSET
1,2
REFERENCES
C. Pickover, Wonders of Numbers, Oxford University Press, NY, 2001, pp. 158-160.
LINKS
C. A. Pickover, "Wonders of Numbers, Adventures in Mathematics, Mind and Meaning," Zentralblatt review
EXAMPLE
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.
CROSSREFS
A093534 gives values of k. Cf. A000330.
Sequence in context: A037156 A116110 A358044 * A231783 A114049 A028471
KEYWORD
nonn
AUTHOR
Jason Earls, Mar 18 2001
STATUS
approved