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A305791
Dirichlet convolution of A175851 with itself.
6
1, 2, 2, 5, 2, 6, 2, 8, 7, 10, 2, 12, 2, 6, 8, 16, 2, 14, 2, 16, 8, 10, 2, 20, 7, 10, 16, 20, 2, 22, 2, 20, 8, 10, 12, 36, 2, 6, 8, 32, 2, 18, 2, 16, 18, 10, 2, 32, 7, 22, 12, 24, 2, 30, 8, 32, 12, 14, 2, 44, 2, 6, 18, 32, 12, 30, 2, 16, 8, 30, 2, 48, 2, 6, 18, 16, 12, 30, 2, 44, 25, 10, 2, 44, 8, 10, 12, 36, 2, 54, 8, 20, 12, 14, 16, 56, 2
OFFSET
1,2
LINKS
FORMULA
a(n) = Sum_{d|n} A175851(d)*A175851(n/d).
PROG
(PARI)
A175851(n) = if(1==n, n, 1 + n - precprime(n));
A305791(n) = sumdiv(n, d, A175851(d)*A175851(n/d));
CROSSREFS
Cf. A175851.
Sequence in context: A323504 A011143 A240081 * A299764 A301830 A305799
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jun 13 2018
STATUS
approved