A192190 Degree of A192189(n) (polynomial-like numbers) in term of number derivatives: number of A003415-iterations up to reaching 0.

0, 1, 1, 1, 2, 1, 3, 2, 1, 1, 4, 1, 1, 3, 2, 1, 3, 1, 1, 5, 2, 1, 4, 1, 2, 1, 4, 1, 5, 1, 3, 2, 1, 1, 6, 2, 1, 2, 1, 1, 2, 1, 2, 1, 3, 1, 3, 6, 1, 1, 1, 2, 1, 1, 1, 2, 2, 3, 1, 5, 2, 1, 1, 4, 1, 2, 3, 1, 1, 2, 1, 1, 2, 4, 1, 6, 1, 2, 7, 1, 1, 2, 3, 1, 1, 1, 1, 3, 2, 5, 3, 1, 2, 5, 2

Offset

1,5

Comments

a(n) = 1 iff A192189(n) is prime.

Links

Table of n, a(n) for n=1..95.

Crossrefs

Cf. A003415, A038554, A192082, A192189.

Sequence in context: A165003 A165011 A213883 * A272729 A064034 A231635

Adjacent sequences: A192187 A192188 A192189 * A192191 A192192 A192193

Keyword

nonn

Author

Vladimir Shevelev, Jun 25 2011

Status

approved