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 A115757 a(n) is the sum of terms in the n-th row of triangle A115756. 3
 1, 2, 5, 10, 14, 19, 30, 35, 48, 53, 73, 90, 105, 116, 130, 142, 166, 181, 216, 228, 246, 261, 298, 317, 358, 381, 416, 438, 473, 507, 555, 586, 621, 657, 705, 733, 804, 834, 866, 899, 976, 1007, 1088, 1128, 1165, 1221, 1292, 1327, 1420, 1457, 1534, 1581 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Michael De Vlieger, Table of n, a(n) for n = 1..1000 (first 568 terms from Diana L. Mecum) MATHEMATICA Fold[{Append[#1, #3], Append[#2, Total@ #3]} & @@ {First@ #1, Last@ #1, Map[Function[m, Count[Last@ #1, k_ /; CoprimeQ[m, k]]], Range@ #2]} &, {{{1}}, {1}}, Range[2, 52]] // Last (* Michael De Vlieger, Sep 29 2017 *) CROSSREFS Cf. A115756, A115759. Sequence in context: A053353 A099792 A331605 * A159032 A082745 A064955 Adjacent sequences: A115754 A115755 A115756 * A115758 A115759 A115760 KEYWORD nonn AUTHOR Leroy Quet, Jan 30 2006 EXTENSIONS a(7) and beyond from Diana L. Mecum, Aug 09 2008 STATUS approved

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Last modified June 2 22:56 EDT 2023. Contains 363102 sequences. (Running on oeis4.)