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A328318 Number of nonzero digits in representation of A328316(n) in primorial base; Number of distinct prime factors in A328316(1+n). 5
0, 1, 1, 2, 1, 2, 1, 3, 5, 16, 104, 7447 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..11.

Index entries for sequences related to primorial base

FORMULA

a(n) = A267263(A328316(n)).

a(n) = A001221(A328316(1+n)).

PROG

(PARI)

A276086(n) = { my(m=1, p=2); while(n, m *= (p^(n%p)); n = n\p; p = nextprime(1+p)); (m); };

A328316(n) = if(!n, 0, A276086(A328316(n-1)));

A267263(n) = { my(s=0, p=2, d); while(n, d = (n%p); s += !!d; n = (n-d)/p; p = nextprime(1+p)); (s); };

A328318(n) = A267263(A328316(n));

\\ Or alternatively, more slowly as:

A328318(n) = omega(A328316(1+n));

CROSSREFS

Cf. A001221, A267263, A276086, A328316, A328317, A328319.

Sequence in context: A256600 A137752 A331917 * A081169 A225765 A300588

Adjacent sequences:  A328315 A328316 A328317 * A328319 A328320 A328321

KEYWORD

nonn,base,hard,more

AUTHOR

Antti Karttunen, Oct 14 2019

STATUS

approved

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Last modified October 31 12:41 EDT 2020. Contains 338101 sequences. (Running on oeis4.)