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 A316489 Positive numbers of the form 8*k + 4 that cannot be expressed as the sum of four distinct odd squares. 2
 4, 12, 20, 28, 36, 44, 52, 60, 68, 76, 92, 100, 108, 124, 132, 148, 172, 188, 220, 268, 292, 388, 412 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS There are no more terms through 10^11. It seems extremely unlikely that any more terms exist. Every odd square is a number of the form 8*k + 1, so every sum of four odd squares is a number of the form 8*k + 4. A316834 lists all numbers that can be expressed in only one way as the sum of four distinct odd squares. LINKS CROSSREFS Cf. A316834. Sequence in context: A328304 A031065 A017113 * A081770 A062876 A301098 Adjacent sequences:  A316486 A316487 A316488 * A316490 A316491 A316492 KEYWORD nonn AUTHOR Jon E. Schoenfield, Jul 27 2018 STATUS approved

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Last modified December 12 01:57 EST 2019. Contains 329948 sequences. (Running on oeis4.)