A026350 a(n) = a(m) if a(m) has already occurred exactly once and n = a(m)+m-1, else a(n) = least positive integer that has not yet occurred.

1, 2, 2, 3, 4, 3, 5, 4, 6, 7, 5, 8, 9, 6, 10, 7, 11, 12, 8, 13, 9, 14, 15, 10, 16, 17, 11, 18, 12, 19, 20, 13, 21, 22, 14, 23, 15, 24, 25, 16, 26, 17, 27, 28, 18, 29, 30, 19, 31, 20, 32, 33, 21, 34, 22, 35, 36, 23, 37, 38, 24, 39, 25, 40, 41, 26

Offset: 1

Author

Clark Kimberling

Keywords

• nonn

Crossrefs

Cf. A026272.

Programs

PARI

A026350=vector(#A026242+1,n,if(n>1,A026242[n-1])+1) \\ Assumes the vector A026242 is defined, cf. there for PARI code. - M. F. Hasler, Sep 17 2014

Formula

a(n+1)=A026242(n)+1, for all n>0. - M. F. Hasler, Sep 17 2014