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A097271 Numbers that are neither the sum of two nonzero squares nor the difference of two nonzero squares. 4
1, 4, 6, 14, 22, 30, 38, 42, 46, 54, 62, 66, 70, 78, 86, 94, 102, 110, 114, 118, 126, 134, 138, 142, 150, 154, 158, 166, 174, 182, 186, 190, 198, 206, 210, 214, 222, 230, 238, 246, 254, 258, 262, 266, 270, 278, 282, 286, 294, 302, 310, 318, 322, 326, 330, 334 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Complement of union of A000404 (sum of squares) and A024352 (difference of squares).

Differs from A062316 only in having an initial 1,4.

LINKS

Table of n, a(n) for n=1..56.

Eric Weisstein's World of Mathematics, Sum of Squares Function.

MATHEMATICA

Module[{nn=70, sq}, sq=Flatten[{Total[#], Abs[#[[1]]-#[[2]]]}&/@Tuples[ Range[ 3nn]^2, 2]]//Union; Take[Complement[Range[Max[sq]], sq], nn]] (* Harvey P. Dale, Nov 04 2016 *)

CROSSREFS

Cf. A000404, A024352, A097268-A097270.

Sequence in context: A310651 A122555 A210632 * A126867 A027632 A175722

Adjacent sequences:  A097268 A097269 A097270 * A097272 A097273 A097274

KEYWORD

nonn

AUTHOR

Ray Chandler, Aug 19 2004

STATUS

approved

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Last modified April 14 12:11 EDT 2021. Contains 342949 sequences. (Running on oeis4.)