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 A287166 Smallest number with exactly n representations as a sum of 7 nonzero squares or 0 if no such number exists. 12
 7, 22, 31, 37, 45, 67, 55, 61, 69, 70, 79, 82, 94, 108, 85, 93, 103, 106, 111, 132, 109, 126, 139, 117, 147, 146, 130, 145, 144, 133, 153, 167, 141, 154, 160, 172, 159, 166, 187, 157, 177, 174, 175, 0, 178, 165 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Eric Weisstein's World of Mathematics, Square Number FORMULA A025431(a(n)) = n for a(n) > 0. EXAMPLE a(1) = 7 because 7 is the smallest number with exactly 1 representation as a sum of 7 nonzero squares: 7 = 1^2 + 1^2 + 1^2 + 1^2 + 1^2 + 1^2 + 1^2; a(2) = 22 because 22 is the smallest number with exactly 2 representations as a sum of 7 nonzero squares: 22 = 1^2 + 1^2 + 1^2 + 1^2 + 1^2 + 1^2 + 4^2 = 1^2 + 1^2 + 2^2 + 2^2 + 2^2 + 2^2 + 2^2, etc. CROSSREFS Cf. A016032, A025414, A025416, A025431, A080654, A287165, A287167. Sequence in context: A297712 A041090 A042639 * A229978 A316840 A063240 Adjacent sequences:  A287163 A287164 A287165 * A287167 A287168 A287169 KEYWORD nonn AUTHOR Ilya Gutkovskiy, May 20 2017 STATUS approved

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Last modified November 30 17:12 EST 2021. Contains 349424 sequences. (Running on oeis4.)