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A319345
Filter sequence combining the prime signature of phi(d) from all divisors d > 1 of n.
4
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 7, 11, 12, 13, 14, 15, 16, 17, 12, 18, 19, 13, 7, 20, 21, 22, 19, 23, 12, 24, 25, 26, 19, 27, 28, 29, 30, 22, 31, 32, 33, 34, 25, 23, 35, 13, 7, 36, 37, 38, 39, 40, 12, 34, 28, 41, 42, 22, 7, 43, 44, 45, 46, 47, 48, 34, 25, 49, 19, 50, 25, 51, 52, 53, 54, 55, 56, 57, 25, 58, 59, 60, 7, 61, 62, 45, 31, 41, 33, 63, 64, 23, 65, 13
OFFSET
1,2
COMMENTS
Restricted growth sequence transform of A319344.
LINKS
PROG
(PARI)
up_to = 65537;
A319344(n) = { my(m=1); fordiv(n, d, if((d>1), m *= prime(A318881(d)))); (m); }; \\ Needs also code from A318881
v319345 = rgs_transform(vector(up_to, n, A319344(n)));
A319345(n) = v319345[n];
CROSSREFS
Cf. also A305985.
Sequence in context: A330814 A305903 A305904 * A376769 A213651 A287796
KEYWORD
nonn
AUTHOR
Antti Karttunen, Sep 17 2018
STATUS
approved