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A093534 Square pyramorphic numbers: n such that sum of first n squares (A000330(n)) ends in n. 1
1, 5, 25, 40, 65, 80, 160, 225, 385, 400, 560, 625, 785, 800, 960, 1185, 2560, 2625, 4000, 5185, 6560, 6025, 8000, 9185, 9376, 10625, 26560, 37185, 40000, 50625, 66560, 77185, 80000, 90625, 226560, 317185, 400000, 490625, 626560, 717185, 800000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

REFERENCES

C. A. Pickover, Wonders of Numbers, Chap. 65, Oxford Univ. Press NY 2000; pp. 158-160.

LINKS

Table of n, a(n) for n=1..41.

MATHEMATICA

l = {}; s = 0; Do[s = s + n^2; If[ Mod[s, 10^Floor[ Log[10, n] + 1]] == n, AppendTo[l, n]], {n, 10^6}]; l (from Robert G. Wilson v May 24 2004)

CROSSREFS

A060204 gives the corresponding sums of squares. Cf. A000330.

Sequence in context: A070389 A098993 A099799 * A070388 A250314 A056872

Adjacent sequences:  A093531 A093532 A093533 * A093535 A093536 A093537

KEYWORD

nonn

AUTHOR

Lekraj Beedassy, May 14 2004

EXTENSIONS

More terms from Robert G. Wilson v, May 24 2004

STATUS

approved

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Last modified November 22 06:18 EST 2014. Contains 249804 sequences.