A023573 Sum of distinct prime divisors of prime(n)-3.

0, 0, 2, 2, 2, 7, 9, 2, 7, 15, 9, 19, 21, 7, 13, 7, 9, 31, 2, 19, 14, 21, 7, 45, 49, 9, 7, 15, 55, 18, 33, 2, 69, 19, 75, 39, 20, 7, 43, 24, 13, 91, 49, 26, 99, 9, 15, 18, 9, 115, 30, 61, 26, 33, 129, 20, 28, 69, 139, 141, 14, 36, 21, 20, 38, 159, 43, 169, 45, 175, 14

Offset

1,3

Links

Table of n, a(n) for n=1..71.

Formula

a(n) = sopf(prime(n)-3). - Wesley Ivan Hurt, Apr 13 2022

Crossrefs

Cf. A000040, A008472 (sopf).

Sequence in context: A266689 A265988 A340976 * A138757 A158927 A367857

Adjacent sequences: A023570 A023571 A023572 * A023574 A023575 A023576

Keyword

nonn

Author

Clark Kimberling

Status

approved