A120951 - OEIS

A120951

Numbers that are not the sum of 5 distinct nonzero squares.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 67, 68, 69, 70, 71, 72, 73, 74, 76, 77, 78, 80, 81, 83, 84, 85, 86, 89, 91, 92, 93, 96, 97, 98, 101, 102, 104, 105, 107, 108, 109, 112, 113, 116, 117, 119, 122, 124, 125, 128, 133, 136, 137, 140, 141, 149, 153, 161, 164, 173, 177, 182, 188, 189, 197, 203, 221, 224, 236, 245

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OFFSET

1,2

COMMENTS

There are no other terms below 5000 and this list (of 124 terms) is probably complete. Is this known?

Thanks to R. K. Guy for supplying the references.

No others n < 10000. - T. D. Noe, Jul 23 2006

Bateman et al. prove that 245 is the last term. - T. D. Noe, Apr 03 2007

REFERENCES

E. M. Wright, Quart. J. Math. Oxford Ser. 4 (1933), 37-51.

LINKS

Franklin T. Adams-Watters, Table of n, a(n) for n = 1..124

Paul T. Bateman, Adolf J. Hildebrand, and George B. Purdy, Sums of distinct squares, Acta Arithmetica 67 (1994), pp. 349-380.

Index entries for sequences related to sums of squares

MATHEMATICA

nn=10000; t=Table[0, {nn}]; lim=Floor[Sqrt[nn]]; sq=Table[i^2, {i, lim}]; Do[n=sq[[i1]]+sq[[i2]]+sq[[i3]]+sq[[i4]]+sq[[i5]]; If[n<=nn, t[[n]]++ ], {i1, lim}, {i2, i1+1, lim}, {i3, i2+1, lim}, {i4, i3+1, lim}, {i5, i4+1, lim}]; Flatten[Position[t, 0]] - T. D. Noe, Jul 23 2006

CROSSREFS

Cf. A004438.

Sequence in context: A272118 A247163 A357759 * A272554 A179797 A268200

Adjacent sequences: A120948 A120949 A120950 * A120952 A120953 A120954

KEYWORD

fini,nonn,full

AUTHOR

Franklin T. Adams-Watters, Jul 18 2006

EXTENSIONS

Entry revised by N. J. A. Sloane, Jul 23 2006

STATUS

approved