A082878 Arithmetic derivative of numbers of the form p*q^k with distinct primes p and q, k>0.

5, 7, 16, 9, 8, 21, 24, 10, 13, 44, 15, 32, 14, 19, 12, 21, 16, 68, 48, 39, 25, 112, 45, 20, 56, 81, 1, 6, 92, 22, 31, 33, 51, 18, 72, 26, 39, 55, 80, 18, 176, 43, 22, 45, 32, 140, 20, 96, 34, 49, 24, 272, 77, 75, 1, 64, 55, 40, 240, 28, 120, 87, 61, 24, 63, 44, 128, 46, 26

Offset

1,1

Comments

a(n) = A003415(A084227(n)).

Links

Table of n, a(n) for n=1..69.

Formula

a(p*q^k) = (p+q)*q^(k-1).

Crossrefs

Sequence in context: A116048 A120282 A132094 * A106506 A029649 A327251

Adjacent sequences: A082875 A082876 A082877 * A082879 A082880 A082881

Keyword

nonn

Author

Reinhard Zumkeller, May 25 2003

Status

approved