A111198 Numbers k such that sequence A_k does not contain a perfect square.

37, 40, 43, 57, 58, 101

Offset: 1

Author

Zak Seidov, Oct 24 2005

Keywords

• nonn
• dumb
• less

Comments

That is, the complete sequence A_k, not just the terms that are shown in the entry, does not contain a perfect square or the negative of a perfect square. (In particular, sequences containing 0 or 1 are excluded.)

No more terms up through 130. Does A000131 contain a perfect square?

I've checked A000131 up to a(25000) and can report that I found no perfect square. - Robert G. Wilson v, Jun 23 2014

Examples

			The first term, 37, refers to the sequence A000037, the nonsquares. All of A000001-A000036 contain obvious square terms.
The second term, 40, refers to A000040, the primes. Obviously any sequence which is a subset of the primes (e.g. A000043) also gives a term.
		

Links

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

Extensions

Let's have no more sequences of this type! - N. J. A. Sloane, Oct 23 2005