A329615 - OEIS

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A329615

Bitwise-AND of exponents of prime factors of A108951(n), where A108951 is fully multiplicative with a(prime(i)) = prime(i)# = Product_{i=1..i} A000040(i).

4

0, 1, 1, 2, 1, 0, 1, 3, 2, 0, 1, 1, 1, 0, 0, 4, 1, 2, 1, 1, 0, 0, 1, 0, 2, 0, 3, 1, 1, 0, 1, 5, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 1, 1, 0, 1, 1, 2, 2, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 6, 0, 0, 1, 1, 0, 0, 1, 0, 1, 0, 2, 1, 0, 0, 1, 1, 4, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 2, 1, 0, 1, 0, 1, 0, 0

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OFFSET

1,4

LINKS

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

Index entries for sequences computed from indices in prime factorization

Index entries for sequences related to primorial numbers

FORMULA

a(n) = A267115(A108951(n)) = A267115(A329600(n)).

a(n) <= A329616(n).

PROG

(PARI)

A034386(n) = prod(i=1, primepi(n), prime(i));

A108951(n) = { my(f=factor(n)); prod(i=1, #f~, A034386(f[i, 1])^f[i, 2]) }; \\ From A108951

A267115(n) = if(n>1, fold(bitand, factor(n)[, 2]), 0); \\ From A267115

A329615(n) = A267115(A108951(n));

CROSSREFS

Cf. A034386, A108951, A267115, A329600, A329616, A329647.

Sequence in context: A255740 A100995 A319273 * A272894 A268387 A136566

Adjacent sequences: A329612 A329613 A329614 * A329616 A329617 A329618

KEYWORD

nonn

AUTHOR

Antti Karttunen, Nov 17 2019

STATUS

approved