1,2

I do not know if this sequence is infinite. Given any term it is easy to compute all earlier terms. The largest number I know of in the sequence is 21977.

Table of n, a(n) for n=1..44.

Cf. A088643, A132075.

Sequence in context: A104386 A171558 A044906 * A293000 A141565 A098549

Adjacent sequences: A255309 A255310 A255311 * A255313 A255314 A255315

nonn

Paul Boddington, Feb 20 2015

approved