A111157 Numbers n such that sequence A_n in this database does not contain a prime.

4, 7, 12, 35, 56, 66, 82, 118, 132, 141, 143, 144, 145, 152, 156, 252

Offset

1,1

Comments

That is, the complete sequence A_n, not just the terms that are shown in the entry, does not contain a prime or the negative of a prime. The only exception to this is for sequences with keyword "dead", when only the visible terms are to be considered.

No other terms below 287. Is 287 a member? This requires proof.

I've checked A000287 up to a(25000) and can report that I found no prime. - Robert G. Wilson v, Jun 23 2014

Links

Table of n, a(n) for n=1..16.

PrimeFan, Esoteric Integer Sequences (Gives a different version.)

Index entries for sequences whose definition involves A_n (or An).

Crossrefs

Cf. A111198.

Sequence in context: A208724 A183336 A102953 * A255340 A272251 A169700

Adjacent sequences: A111154 A111155 A111156 * A111158 A111159 A111160

Keyword

nonn,more,dumb

Author

N. J. A. Sloane, following a suggestion of Alonso del Arte, Oct 21 2005

Status

approved