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 A317927 Numerators of rational valued sequence whose Dirichlet convolution with itself yields A005187. 4
 1, 3, 2, 19, 4, 2, 11, 63, 6, 3, 19, 13, 23, 17, 5, 867, 16, 4, 35, 5, 17, 25, 21, 11, 31, 29, 13, 113, 27, 13, 57, 3069, 13, 9, 23, 25, 71, 41, 14, 69, 79, 33, 41, 169, 9, 25, 89, 615, 259, 53, 17, 197, 51, 25, 29, 389, 20, 31, 113, 59, 117, 67, 10, 22199, 18, 14, 131, 31, 51, 71, 69, 11, 143, 77, 22, 281, 91, 35, 153, 489, 71, 85, 81, 151, 19 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS The first negative term is a(330) = -21. LINKS Antti Karttunen, Table of n, a(n) for n = 1..16384 FORMULA a(n) = numerator of f(n), where f(1) = 1, f(n) = (1/2) * (A005187(n) - Sum_{d|n, d>1, d 1. PROG (PARI) A005187(n) = { my(s=n); while(n>>=1, s+=n); s; }; A317927perA317928(n) = if(1==n, n, (A005187(n)-sumdiv(n, d, if((d>1)&&(d1)&&(d

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Last modified November 28 19:28 EST 2023. Contains 367419 sequences. (Running on oeis4.)