A319340 - OEIS

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A319340

Sum of Euler totient function and its Dirichlet inverse: a(n) = A000010(n) + A023900(n).

14

2, 0, 0, 1, 0, 4, 0, 3, 4, 8, 0, 6, 0, 12, 16, 7, 0, 8, 0, 12, 24, 20, 0, 10, 16, 24, 16, 18, 0, 0, 0, 15, 40, 32, 48, 14, 0, 36, 48, 20, 0, 0, 0, 30, 32, 44, 0, 18, 36, 24, 64, 36, 0, 20, 80, 30, 72, 56, 0, 8, 0, 60, 48, 31, 96, 0, 0, 48, 88, 0, 0, 26, 0, 72, 48, 54, 120, 0, 0, 36, 52, 80, 0, 12, 128, 84, 112, 50, 0, 16

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OFFSET

1,1

LINKS

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

FORMULA

a(n) = A000010(n) + A023900(n).

a(n) = A318833(n) - A051953(n).

PROG

(PARI)

A023900(n) = factorback(apply(p -> 1-p, factor(n)[, 1]));

A319340(n) = (eulerphi(n)+A023900(n));

CROSSREFS

Cf. A000010, A023900, A051953, A318833, A319341.

Sequence in context: A355687 A349349 A349443 * A349389 A354876 A323408

Adjacent sequences: A319337 A319338 A319339 * A319341 A319342 A319343

KEYWORD

nonn

AUTHOR

Antti Karttunen, Sep 17 2018

STATUS

approved