A353360 -id:A353360

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Search: a353360 -id:a353360

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A353330

a(n) = A006047(A156552(n)).

+10
2

1, 2, 3, 2, 4, 6, 9, 6, 3, 2, 12, 6, 12, 18, 4, 6, 12, 8, 36, 6, 3, 6, 16, 18, 4, 18, 12, 18, 81, 6, 144, 8, 12, 24, 9, 2, 324, 24, 12, 8, 432, 8, 108, 24, 12, 6, 576, 18, 9, 18, 48, 72, 11664, 6, 4, 54, 12, 216, 972, 24, 3888, 162, 12, 6, 36, 18, 1728, 24, 12, 24, 8748, 6, 5184, 648, 27, 18, 16, 72, 34992, 54, 4, 72

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..10000

Index entries for sequences computed from indices in prime factorization

FORMULA

a(n) = A006047(A156552(n)).

PROG

(PARI)

A006047(n) = { my(m=1, d); while(n, d = (n%3); m *= (1+d); n = (n-d)/3); m; };

A156552(n) = { my(f = factor(n), p, p2 = 1, res = 0); for(i = 1, #f~, p = 1 << (primepi(f[i, 1]) - 1); res += (p * p2 * (2^(f[i, 2]) - 1)); p2 <<= f[i, 2]); res };

A353330(n) = A006047(A156552(n));

CROSSREFS

Cf. A006047, A156552.

Cf. also A329903, A332814, A341353 and A353360.

KEYWORD

nonn,look

AUTHOR

Antti Karttunen, Apr 20 2022

STATUS

approved

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