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 A254060 a(n) is the denominator of the generalized continued fraction with terms sigma(m)/m for m=1 to n. 2
 1, 5, 19, 37, 223, 297, 3863, 35359, 36845, 2160481, 2168207, 1246043, 65019169, 6514845019, 39336218671, 23752562695, 14840826739603, 99852376463843, 2194011687605077, 24037016781791473, 44229671263152569, 965358470386151983, 169222371166274070791 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Table of n, a(n) for n=1..23. EXAMPLE The values of sigma(n)/n are: 1/1, 3/2, 4/3, 7/4, 6/5, ... For n=1, the continued fraction is 1/1 so a(1)=1. For n=2, it is 1/(1+3/2) = 2/5, so a(2)=5. For n=3, it is 1/(1+3/(2+4/3)) = 10/19, so a(3)=19. PROG (PARI) a(nn) = {my(v = vector(nn, n, sigma(n)/n)); for (n=1, nn, val = v[n]; forstep(k=n-1, 1, -1, val = numerator(v[k])/(denominator(v[k]) + val); ); print1(denominator(val), ", "); ); } CROSSREFS Cf. A017665 and A017666 (numerator and denominator of sigma(n)/n). Cf. A254059 (denominators), A254061. Sequence in context: A146861 A068963 A257929 * A129828 A239831 A146600 Adjacent sequences: A254057 A254058 A254059 * A254061 A254062 A254063 KEYWORD nonn,frac AUTHOR Michel Marcus, Jan 24 2015 STATUS approved

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Last modified February 29 16:02 EST 2024. Contains 370425 sequences. (Running on oeis4.)