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 A158915 Least number k such that there is an m > k with sigma_n(k) = sigma_n(m). 1
 2, 6, 6, 184926 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS It is easy to verify the first three terms using sequences A000005, A000203, and A001157. The first term of A131908 gives a(3). The a(4) term is greater than 10^8. Does a(n) exist for all n? LINKS EXAMPLE sigma_0(2)=sigma_0(3); sigma_1(6)=sigma_1(12); sigma_2(6)=sigma_2(7); sigma_3(184926)=sigma_3(194315). CROSSREFS Sequence in context: A279841 A219195 A212223 * A257478 A243523 A011044 Adjacent sequences:  A158912 A158913 A158914 * A158916 A158917 A158918 KEYWORD more,nonn AUTHOR T. D. Noe, Mar 30 2009 STATUS approved

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Last modified May 25 14:51 EDT 2022. Contains 354071 sequences. (Running on oeis4.)