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A334216 a(n) is the number of distinct terms in the n-th row of A334215. 2
1, 2, 2, 3, 2, 2, 2, 3, 3, 2, 2, 3, 2, 2, 2, 4, 2, 3, 2, 3, 2, 2, 2, 3, 3, 2, 3, 3, 2, 2, 2, 4, 2, 2, 2, 3, 2, 2, 2, 3, 2, 2, 2, 3, 3, 2, 2, 4, 3, 3, 2, 3, 2, 3, 2, 3, 2, 2, 2, 3, 2, 2, 3, 5, 2, 2, 2, 3, 2, 2, 2, 4, 2, 2, 3, 3, 2, 2, 2, 4, 4, 2, 2, 3, 2, 2, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..87.

FORMULA

a(n) <= A000005(n).

a(p^k) = A000267(k) for any k >= 0 and prime number p.

PROG

(PARI) a(n) = { my (f=factor(n)); #Set(apply (k -> prod (i=1, #f~, f[i, 1]^(f[i, 2]\k)), [1..1+if (n==1, 0, vecmax(f[, 2]~))])) }

CROSSREFS

Cf. A000005, A000267, A334215, A334217.

Sequence in context: A278744 A346213 A082091 * A100549 A085962 A160821

Adjacent sequences:  A334213 A334214 A334215 * A334217 A334218 A334219

KEYWORD

nonn

AUTHOR

Rémy Sigrist, Apr 19 2020

STATUS

approved

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Last modified July 29 22:26 EDT 2021. Contains 346346 sequences. (Running on oeis4.)