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 A283123 a(n) = sigma(9*n). 5
 13, 39, 40, 91, 78, 120, 104, 195, 121, 234, 156, 280, 182, 312, 240, 403, 234, 363, 260, 546, 320, 468, 312, 600, 403, 546, 364, 728, 390, 720, 416, 819, 480, 702, 624, 847, 494, 780, 560, 1170, 546, 960, 572, 1092, 726, 936, 624, 1240, 741, 1209 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Seiichi Manyama, Table of n, a(n) for n = 1..10000 FORMULA a(n) = A000203(9*n). MATHEMATICA Table[DivisorSigma[1, 9 n], {n, 50}] (* Michael De Vlieger, Mar 01 2017 *) CROSSREFS Sigma(k*n): A000203 (k=1), A062731 (k=2), A144613 (k=3), A193553 (k=4), A283118 (k=5), A224613 (k=6), A283078 (k=7), A283122 (k=8), this sequence (k=9). Sequence in context: A209991 A299055 A158647 * A152741 A168235 A258597 Adjacent sequences:  A283120 A283121 A283122 * A283124 A283125 A283126 KEYWORD nonn AUTHOR Seiichi Manyama, Mar 01 2017 STATUS approved

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Last modified February 25 23:44 EST 2020. Contains 332270 sequences. (Running on oeis4.)