1,2

First few steps are:

1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,...

n = 1; delete the first digit in the term at position 1+a(1) = 2: 2;

1,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,...

n = 2; delete the first digit in the term at position 2+a(2) = 5: 6;

1,3,4,5,7,8,9,10,11,12,13,14,15,16,17,18,19,20,...

n = 3; delete the first digit in the term at position 3+a(3) = 7: 9;

1,3,4,5,7,8,10,11,12,13,14,15,16,17,18,19,20,...

n = 4; delete the first digit in the term at position 4+a(4) = 9: 1;

1,3,4,5,7,8,10,11,2,13,14,15,16,17,18,19,20,...

n = 5; delete the first digit in the term at position 5+a(5) = 12: 1;

1,3,4,5,7,8,10,11,2,13,14,5,16,17,18,19,20,...

n = 6; delete the first digit in the term at position 6+a(6) = 14: 1;

1,3,4,5,7,8,10,11,2,13,14,5,16,7,18,19,20,...

Cf. A137292, A136120, A136119, A136259, A136272, A137319, A137417, A137418.

Sequence in context: A055074 A035059 A137832 this_sequence A063732 A047367 A039043

Adjacent sequences: A137835 A137836 A137837 this_sequence A137839 A137840 A137841

easy,nonn,base

Ctibor O. Zizka (ctibor.zizka(AT)seznam.cz), Apr 29 2008