1,2

David Broadhurst and Hiroaki Yamanouchi, Table of n, a(n) for n = 1..99 (First 61 terms from Hiroaki Yamanouchi)

A261570(11) = 12345678911987654321 = (11)(59)(34631)(43117)(6373)(1999), so a(10) = 11.

Note that a(2007) = A261570(2007) is a 21233-digit (probable) prime.

Cf. A261570, A067063, A075023.

Sequence in context: A194706 A110435 A110774 * A067063 A075023 A205960

Adjacent sequences: A261408 A261409 A261410 * A261412 A261413 A261414

nonn

N. J. A. Sloane, Aug 24 2015, based on Robert G. Wilson v's comment in A261570.

a(41)-a(59) from Hiroaki Yamanouchi, Aug 24 2015

approved