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 A342903 a(n) is the smallest number that is the sum of n positive squares in two ways. 10
 50, 27, 28, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,1 COMMENTS This is r(n,2,2) in Alter's notation. LINKS R. Alter, Computations and generalizations on a remark of Ramanujan, pp. 182-196 of "Analytic Number Theory (Philadelphia, 1980)", ed. M. I. Knopp, Lect. Notes Math., Vol. 899, 1981. See Eq. (15), page 188. Index entries for linear recurrences with constant coefficients, signature (2,-1). FORMULA a(n) = n+15 for n >= 5. EXAMPLE a(2) = 50 = 1+49 = 25+25. a(3) = 27 = 1+1+25 = 9+9+9. a(5) = 20 = 1+1+1+1+16 = 4+4+4+4+4. CROSSREFS Cf. A230563, A342902. Sequence in context: A033370 A090691 A033980 * A207149 A207142 A244277 Adjacent sequences: A342900 A342901 A342902 * A342904 A342905 A342906 KEYWORD nonn AUTHOR N. J. A. Sloane, Apr 03 2021 STATUS approved

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Last modified February 4 05:49 EST 2023. Contains 360046 sequences. (Running on oeis4.)