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 A001422 Numbers which are not the sum of distinct squares. This is the complete list (Sprague). 23
 2, 3, 6, 7, 8, 11, 12, 15, 18, 19, 22, 23, 24, 27, 28, 31, 32, 33, 43, 44, 47, 48, 60, 67, 72, 76, 92, 96, 108, 112, 128 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 REFERENCES S. Lin, Computer experiments on sequences which form integral bases, pp. 365-370 of J. Leech, editor, Computational Problems in Abstract Algebra. Pergamon, Oxford, 1970. Harry L. Nelson, The Partition Problem, J. Rec. Math., 20 (1988), 315-316. J. Roberts, Lure of the Integers, Math. Assoc. America, 1992, p. 222. LINKS R. E. Dressler and T. Parker, 12,758, Math. Comp. 28 (1974), 313-314. T. Sillke, Not the sum of distinct squares R. Sprague, Über Zerlegungen in ungleiche Quadratzahlen, Math. Z. 51, (1948), 289-290. Eric Weisstein's World of Mathematics, Square Number. FORMULA Complement of A003995. MATHEMATICA nn=50; t=Rest[CoefficientList[Series[Product[(1+x^(k*k)), {k, nn}], {x, 0, nn*nn}], x]]; Flatten[Position[t, 0]] (* T. D. Noe, Jul 24 2006 *) CROSSREFS Cf. A025524 (number of numbers not the sum of distinct n-th-order polygonal numbers) Cf. A007419 (largest number not the sum of distinct n-th-order polygonal numbers) Cf. A053614, A121405 (corresponding sequences for triangular and pentagonal numbers) Cf. A033461, A276517. Sequence in context: A064472 A276887 A276517 * A097757 A304028 A155152 Adjacent sequences:  A001419 A001420 A001421 * A001423 A001424 A001425 KEYWORD nonn,fini,full AUTHOR N. J. A. Sloane, Jeff Adams (jeff.adams(AT)byu.net) STATUS approved

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Last modified December 18 23:46 EST 2018. Contains 318245 sequences. (Running on oeis4.)