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.
Sequence in context: A113466 A007301 A009715 * A009011 A009498 A076253
Adjacent sequences: A138659 A138660 A138661 * A138663 A138664 A138665
nonn,base
Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Mar 25 2008
