1,2

First few terms of A137292 are 1,3,4,5,7,9,10,13,... . The first run of at least two consecutive numbers is 3,4; the first run of at least three consecutive numbers is 3,4,5. Hence a(2) = a(3) = 3.

Cf. A137292.

Adjacent sequences: A138659 A138660 A138661 this_sequence A138663 A138664 A138665

Sequence in context: A113466 A007301 A009715 this_sequence A009011 A009498 A076253

nonn,base

Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Mar 25 2008