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 A332448 a(n) = A007814(A087808(sigma(n))). 3
 0, 1, 2, 0, 2, 3, 3, 2, 0, 1, 3, 2, 1, 4, 4, 0, 1, 0, 2, 1, 5, 2, 4, 4, 0, 1, 3, 3, 3, 3, 5, 1, 5, 2, 5, 1, 2, 4, 3, 1, 1, 6, 4, 2, 1, 3, 5, 2, 0, 0, 3, 1, 2, 5, 3, 5, 4, 1, 4, 3, 1, 6, 3, 0, 2, 4, 2, 2, 6, 4, 3, 1, 1, 1, 2, 3, 6, 3, 4, 1, 0, 2, 2, 5, 3, 2, 5, 2, 1, 1, 4, 3, 7, 4, 5, 3, 1, 4, 2, 0, 2, 4, 3, 1, 7 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS Antti Karttunen, Table of n, a(n) for n = 1..65537 FORMULA a(n) = A007814(A332224(n)) = A332447(A000203(n)) = A007814(A087808(A000203(n))). PROG (PARI) A087808(n) = if(n<1, 0, if(n%2==0, 2*A087808(n/2), A087808((n-1)/2)+1)); A332448(n) = valuation(A087808(sigma(n)), 2); CROSSREFS Cf. A000203, A007814, A087808, A332224, A332447. Cf. A332443 (positions of zeros). Sequence in context: A171731 A323212 A185815 * A321132 A003987 A307302 Adjacent sequences:  A332445 A332446 A332447 * A332449 A332450 A332451 KEYWORD nonn AUTHOR Antti Karttunen, Feb 14 2020 STATUS approved

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Last modified July 27 15:49 EDT 2021. Contains 346308 sequences. (Running on oeis4.)