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A297109 If n is prime(k)^e, e >= 1, then a(n) = k, otherwise 0. 2
0, 1, 2, 1, 3, 0, 4, 1, 2, 0, 5, 0, 6, 0, 0, 1, 7, 0, 8, 0, 0, 0, 9, 0, 3, 0, 2, 0, 10, 0, 11, 1, 0, 0, 0, 0, 12, 0, 0, 0, 13, 0, 14, 0, 0, 0, 15, 0, 4, 0, 0, 0, 16, 0, 0, 0, 0, 0, 17, 0, 18, 0, 0, 1, 0, 0, 19, 0, 0, 0, 20, 0, 21, 0, 0, 0, 0, 0, 22, 0, 2, 0, 23, 0, 0, 0, 0, 0, 24, 0, 0, 0, 0, 0, 0, 0, 25, 0, 0, 0, 26, 0, 27, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..65537

FORMULA

If A001221(n) = 1 [when n is in A000961], then a(n) = A055396(n) = A001511(A297108(n)), otherwise 0.

PROG

(PARI) A297109(n) = if(1==omega(n), primepi(factor(n)[1, 1]), 0);

CROSSREFS

Cf. A000720, A000961, A001221, A001511, A055396, A100995, A297108.

Sequence in context: A096269 A260437 A262677 * A073312 A166514 A246024

Adjacent sequences:  A297106 A297107 A297108 * A297110 A297111 A297112

KEYWORD

nonn

AUTHOR

Antti Karttunen, Dec 25 2017

STATUS

approved

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Last modified March 25 03:50 EDT 2019. Contains 321450 sequences. (Running on oeis4.)