A030013 Moebius transform of {1, primes}.

1, 1, 2, 3, 6, 7, 12, 12, 16, 15, 28, 17, 36, 27, 34, 30, 52, 32, 60, 41, 56, 43, 78, 40, 82, 59, 82, 59, 106, 43, 112, 80, 100, 83, 120, 70, 150, 95, 124, 88, 172, 73, 180, 115, 134, 117, 198, 98, 210, 122, 174, 133, 238, 100, 216, 142, 200, 161, 270, 107, 280, 169, 206, 180

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn

Links

• N. J. A. Sloane, Transforms

Crossrefs

Cf. A008578 ({1, primes}), A007444 (Moebius transform of primes), A008683.

Programs

PARI

a(n) = sumdiv(n, d, if (d==1, 1, prime(d-1))*moebius(n/d)); \\ Michel Marcus, Nov 04 2018

Extensions

Offset 1 and more terms from Michel Marcus, Nov 04 2018