A309340 a(n) is the least nonnegative number whose binary digits do not appear in order (not necessarily consecutively) in the concatenation of the binary representations of all previous terms.

0, 1, 2, 4, 9, 38, 304, 2433, 38938, 2492040, 318981139, 163318343502

Offset: 1

Author

Rémy Sigrist, Jul 24 2019

Keywords

• nonn
• base
• hard
• more

Comments

This sequence is a variant of A118248.

a(13) > 4.5*10^12. - Giovanni Resta, Aug 08 2019

Crossrefs

See A308540 for the decimal variant.

Cf. A118248.

Extensions

a(12) from Giovanni Resta, Aug 08 2019