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A332224 a(n) = A087808(sigma(n)). 8
1, 2, 4, 3, 4, 8, 8, 4, 5, 10, 8, 12, 6, 16, 16, 5, 10, 7, 12, 14, 32, 20, 16, 16, 5, 14, 24, 24, 8, 40, 32, 6, 32, 12, 32, 10, 12, 16, 24, 18, 14, 64, 16, 28, 14, 40, 32, 20, 13, 11, 40, 34, 12, 32, 40, 32, 48, 18, 16, 56, 10, 64, 40, 7, 28, 80, 36, 12, 64, 80, 40, 34, 22, 26, 20, 40, 64, 56, 48, 22, 17, 12, 28, 96, 24, 68, 32, 36, 18 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
FORMULA
a(n) = A087808(A000203(n)).
MATHEMATICA
Block[{s = DivisorSigma[1, Range[90]], t}, t = Nest[Append[#1, If[EvenQ[#2], 2 #1[[#2/2 + 1]], #1[[(#2 - 1)/2 + 1]] + 1]] & @@ {#, Length@ #} &, {0}, Max@ s]; t[[Most@ s + 1]] ] (* Michael De Vlieger, Feb 12 2020 *)
PROG
(PARI)
A087808(n) = if(n<1, 0, if(n%2==0, 2*A087808(n/2), A087808((n-1)/2)+1));
A332224(n) = A087808(sigma(n));
CROSSREFS
Cf. also A324293.
Sequence in context: A133702 A328486 A349606 * A080001 A178938 A228196
KEYWORD
nonn
AUTHOR
Antti Karttunen, Feb 12 2020
STATUS
approved

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Last modified April 21 19:32 EDT 2024. Contains 371885 sequences. (Running on oeis4.)