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A350864
Nonprimes that are not the sum of 2 nonzero squares.
0
1, 4, 6, 12, 14, 15, 21, 22, 24, 27, 28, 30, 33, 35, 38, 39, 42, 44, 46, 48, 51, 54, 55, 56, 57, 60, 62, 63, 66, 69, 70, 75, 76, 77, 78, 84, 86, 87, 88, 91, 92, 93, 94, 95, 96, 99, 102, 105, 108, 110, 111, 112, 114, 115, 118, 119, 120, 123, 124, 126, 129, 132
OFFSET
1,2
COMMENTS
a(1) = 1 and a(2) = 4 are squares, but are not the sum of two nonzero squares. If zero were allowed, then 1 and 4 would not be terms, since 1 = 1 + 0 and 4 = 4 + 0.
MATHEMATICA
a[n_] := Complement[Table[m, {m, 1, n}], Table[Prime[m], {m, 1, PrimePi[n]}], Select[Range[5, n], SquaresR[2, #] != 0 &]]; a[132]
CROSSREFS
Intersection of A018252 and A018825.
Cf. A001481.
Sequence in context: A310594 A359040 A310595 * A175593 A163097 A110178
KEYWORD
nonn
AUTHOR
Robert P. P. McKone, Jan 19 2022
STATUS
approved