1,2

Along with the letters "T" and "I", this completes the series, i.e. no other letters in the alphabet can substain a sequence with such a definition.

Table of n, a(n) for n=1..55.

Cf. A005224 and A049525.

Sequence in context: A069482 A274012 A102045 * A274356 A275178 A171787

Adjacent sequences: A055505 A055506 A055507 * A055509 A055510 A055511

easy,nonn,word

Robert G. Wilson v, Jun 29 2000

approved