A055517 Largest integer k such that k | Phi(k) - d(k) + n, or 0 if no such k exists, where d() is the number of divisors.

30, 4, 12, 0, 1, 4, 9, 2, 25, 4, 49, 15, 14, 27, 121, 35, 169, 33, 26, 55, 289, 77, 361, 91, 38, 85, 529, 143, 46, 133, 44, 187, 841, 221, 961, 247, 62, 253, 42, 323, 1369, 217, 74, 391, 1681, 437, 1849, 403, 86, 493, 2209

Offset

0,1

Comments

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

Links

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

Example

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

Crossrefs

Cf. A020488.

Sequence in context: A307026 A040882 A040883 * A040884 A040880 A040881

Adjacent sequences: A055514 A055515 A055516 * A055518 A055519 A055520

Keyword

nonn

Author

Robert G. Wilson v, Jul 03 2000

Status

approved