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 A045796 Numbers m = usigma(sigma(n))/n such that usigma(sigma(n)) is divisible by n. 2
 1, 2, 2, 3, 3, 2, 5, 2, 3, 4, 2, 2, 4, 4, 2, 2, 4, 7, 4, 6, 3, 4, 5, 3, 4, 5, 4, 5, 3, 4, 4, 2, 5, 4, 6, 4, 8, 7, 6, 4, 5, 3, 2, 4, 5, 7, 7, 4, 4, 2, 9, 5, 5, 4, 8, 4, 4, 4, 8, 7, 4, 4, 4, 5, 6, 4, 8, 5, 8, 8, 6, 4, 6, 4, 5, 6, 4, 4, 4, 8, 5, 4, 6, 5, 8, 7, 5 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS a(n) = m values in A045795. - Donovan Johnson, Mar 12 2013 LINKS Donovan Johnson, Table of n, a(n) for n = 1..100 FORMULA a(n) = usigma(sigma(A045795(n)))/A045795(n). MAPLE A034448 := proc(n) local ans, i: ans := 1: for i from 1 to nops(ifactors(n)[ 2 ]) do ans := ans*(1+ifactors(n)[2][i][1]^ifactors(n)[2][i][2]): od: RETURN(ans) end: isA045795 := proc(n) if A034448(numtheory[sigma](n)) mod n = 0 then A034448(numtheory[sigma](n))/n ; else -1 ; fi ; end: A045796 := proc() local n, a : n := 2: while true do a := isA045795(n) ; if a>=0 then printf("%d, ", a) ; fi ; n := n+1: od : end: A045796() ; # R. J. Mathar, Jun 26 2007 CROSSREFS Cf. A045795, A034448. Sequence in context: A167618 A211707 A303363 * A127684 A036012 A084401 Adjacent sequences:  A045793 A045794 A045795 * A045797 A045798 A045799 KEYWORD nonn AUTHOR EXTENSIONS Corrected and extended by R. J. Mathar, Jun 26 2007 Missing first term added and offset corrected by Donovan Johnson, Mar 12 2013 STATUS approved

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Last modified May 22 09:50 EDT 2022. Contains 353949 sequences. (Running on oeis4.)