1,2

A091460(a(n))=n and A091460(m)<>n for m<a(n).

Table of n, a(n) for n=1..21.

a(7) = 44->'101100', {0+k*1: 0<=k<7}: bbbbb0 => 1bbbbb => 10bbbb => bb11bb => bbb100 => 101bbb => bb110b.

a(6) > 44: Although there is an arithmetic progression of length 6 in the binary expansion of 44, it is extendable (to length 7).

Sequence in context: A175182 A291221 A052616 * A078091 A073883 A248982

Adjacent sequences: A091458 A091459 A091460 * A091462 A091463 A091464

nonn,base

Reinhard Zumkeller, Jan 12 2004

a(12)-a(13) by Álvar Ibeas, Sep 09 2020

a(14)-a(21) by Álvar Ibeas, Sep 12 2020

approved