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 A196225 Smallest number k such that sigma(tau(k)) = n, or 0 if there is no such k. 0
 1, 0, 2, 4, 0, 16, 6, 64, 0, 0, 0, 12, 36, 4096, 24, 0, 0, 48, 0, 262144, 0, 0, 0, 192, 0, 0, 0, 60, 0, 268435456, 120, 576, 0, 0, 0, 3072, 0, 68719476736, 180, 900, 0, 240, 0, 4398046511104, 0, 0, 0, 9216, 0, 0, 0, 0, 0, 196608, 0, 960, 46656, 0, 0, 360, 0, 1152921504606846976 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Smallest number k such that A062069(k) = A000203(A000005(k)) = n, or 0 if there is no such k. LINKS Table of n, a(n) for n=1..62. FORMULA a(n)=0 iff A051444(n) = 0. EXAMPLE a(6) = 16 because number 16 is the smallest number k such that sigma(tau(k)) = 6; (tau(16)=5, sigma(5)=6). CROSSREFS Cf. A062069 (sigma(tau(n))), A000203(sigma(n)), A000005(tau(n)). Sequence in context: A203850 A106603 A059057 * A127511 A321956 A173315 Adjacent sequences: A196222 A196223 A196224 * A196226 A196227 A196228 KEYWORD nonn AUTHOR Jaroslav Krizek, Jan 02 2013 STATUS approved

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Last modified September 23 09:36 EDT 2023. Contains 365544 sequences. (Running on oeis4.)