0,1

In the case of n = 3, the condition is satisfied for all the primes.

Table of n, a(n) for n=0..50.

for a(2), 12 | [ Phi(12) + d(12) + 2 ].

Cf. A020488.

Sequence in context: A307026 A040882 A040883 * A040884 A040880 A040881

Adjacent sequences: A055514 A055515 A055516 * A055518 A055519 A055520

nonn

Robert G. Wilson v, Jul 03 2000

approved