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 term at position 1+digitsum(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 term at position 2+digitsum(3) = 5: 6;

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

n = 3; delete term at position 3+digitsum(4) = 7: 9;

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

n = 4; delete term at position 4+digitsum(5) = 9: 12;

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

n = 5; delete term at position 5+digitsum(7) = 12: 16;

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

n = 6; delete term at position 6+digitsum(8) = 14: 19;

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

n = 7; delete term at position 7+digitsum(10) = 8: 11;

1,3,4,5,7,8,10,13,14,15,17,18,20,...

Cf. A000959 (lucky numbers), A000027, A138662.

Sequence in context: A089230 A098090 A026347 this_sequence A047500 A131613 A138494

Adjacent sequences: A137289 A137290 A137291 this_sequence A137293 A137294 A137295

easy,nonn,base

Ctibor O. Zizka (ctibor.zizka(AT)seznam.cz), Mar 15 2008, Mar 17 2008

Edited, corrected and extended by Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Mar 25 2008