A378755 -id:A378755 - cp's OEIS frontend

A378754 Dirichlet convolution of -A252748 and A323910.

1, 0, -1, -2, -1, -2, -3, -10, -10, -2, -1, -10, -3, -6, -5, -38, -1, -22, -3, -10, -11, -2, -5, -42, -14, -6, -60, -22, -1, -14, -5, -130, -5, -2, -11, -76, -3, -6, -11, -42, -1, -30, -3, -10, -36, -10, -5, -158, -46, -30, -5, -22, -5, -144, -5, -78, -11, -2, -1, -58, -5, -10, -64, -422, -11, -14, -3, -10, -17, -30

Offset: 1

Antti Karttunen, Dec 11 2024

sign

Cf. A033879, A252748, A323910, A378755 (Dirichlet inverse).

A033879(n) = (n+n-sigma(n));
memoA323910 = Map();
A323910(n) = if(1==n,1,my(v); if(mapisdefined(memoA323910,n,&v), v, v = -sumdiv(n,d,if(dA033879(n/d)*A323910(d),0)); mapput(memoA323910,n,v); (v)));
A003961(n) = { my(f=factor(n)); for (i=1, #f~, f[i, 1] = nextprime(f[i, 1]+1)); factorback(f); };
A252748(n) = (A003961(n) - (2*n));
A378754(n) = sumdiv(n,d,-A252748(d)*A323910(n/d));

a(n) = Sum_{d|n} -A252748(d)*A323910(n/d).

A379107 Dirichlet convolution of A033879 and A378990, where A033879 is the deficiency of n, and A378990 is the Dirichlet inverse of the binary weight of n.

Original entry on oeis.org

1, 0, 0, 0, 2, -2, 3, 0, 3, -2, 7, -4, 9, -2, -2, 0, 14, -4, 15, -4, 1, -2, 18, -8, 12, -2, 4, -4, 24, -10, 25, 0, 2, -2, 7, -8, 33, -2, 0, -8, 37, -12, 38, -4, 2, -2, 41, -16, 29, -8, -2, -4, 48, -14, 13, -8, 0, -2, 53, -20, 55, -2, -1, 0, 20, -20, 63, -4, 3, -16, 66, -16, 69, -2, -6, -4, 24, -24, 73, -16, 24, -2, 78

Offset: 1

Antti Karttunen, Dec 16 2024

sign

Cf. A000120, A033879, A378990, A379106 (Dirichlet inverse).

Cf. also A294898, A378755, A378757.

A033879(n) = (n+n-sigma(n));
memoA378990 = Map();
A378990(n) = if(1==n,1,my(v); if(mapisdefined(memoA378990,n,&v), v, v = -sumdiv(n,d,if(dA378990(d),0)); mapput(memoA378990,n,v); (v)));
A379107(n) = sumdiv(n,d,A033879(d)*A378990(n/d));

a(n) = Sum_{d|n} A033879(d)*A378990(n/d).

cp's OEIS Frontend

A378754 Dirichlet convolution of -A252748 and A323910.

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