A060204 Square pyramorphic numbers: suppose the k-th square pyramidal number S(k) (A000330) ends in k; sequence gives value of S(k).

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

Table of n, a(n) for n=1..22.

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

Adjacent sequences: A060201 A060202 A060203 * A060205 A060206 A060207

Keyword

nonn

Author

Jason Earls, Mar 18 2001

Status

approved