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A336844 a(n) = A336698(A003961(n)). 6
1, 1, 1, 7, 1, 1, 1, 3, 1, 1, 1, 5, 5, 1, 1, 61, 3, 1, 1, 7, 5, 1, 1, 1, 29, 5, 5, 5, 1, 1, 5, 23, 11, 3, 1, 101, 11, 1, 7, 3, 3, 5, 1, 23, 1, 1, 7, 91, 67, 29, 1, 59, 1, 5, 1, 1, 5, 1, 1, 5, 9, 5, 47, 547, 5, 11, 5, 33, 23, 1, 19, 39, 3, 11, 43, 5, 11, 7, 11, 61, 391, 3, 23, 59, 3, 1, 1, 9, 25, 1, 7, 49, 29, 7, 1, 137 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..16383

Antti Karttunen, Data supplement: n, a(n) computed for n = 1..65537

Index entries for sequences computed from indices in prime factorization

Index entries for sequences related to sigma(n)

FORMULA

a(n) = A000265(1+A000265(A003973(n))).

a(n) = A336698(A003961(n)) = A336699(A003961(n)).

PROG

(PARI)

A000265(n) = (n>>valuation(n, 2));

A003973(n) = { my(f = factor(n)); for(i=1, #f~, f[i, 1] = nextprime(f[i, 1]+1)); sigma(factorback(f)); };

A336844(n) = A000265(1+A000265(A003973(n)));

CROSSREFS

Cf. A000265, A000203, A003961, A003973, A336698, A336699, A336842.

Sequence in context: A091258 A174544 A168423 * A072101 A088840 A344696

Adjacent sequences:  A336841 A336842 A336843 * A336845 A336846 A336847

KEYWORD

nonn

AUTHOR

Antti Karttunen, Aug 06 2020

STATUS

approved

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Last modified September 23 13:46 EDT 2021. Contains 347617 sequences. (Running on oeis4.)