login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

a(n) is the smallest positive number not yet in the sequence that contains exactly one even digit and exactly one odd digit from a(n-1), and no digit in a(n) is repeated.
0

%I #14 Sep 12 2019 23:50:12

%S 10,102,12,21,120,103,30,130,104,14,41,124,123,23,32,132,125,25,52,

%T 152,126,16,61,106,105,50,150,107,70,170,108,18,81,128,127,27,72,172,

%U 129,29,92,192,142,134,34,43,143,140,109,90,190,160,136,36,63,163

%N a(n) is the smallest positive number not yet in the sequence that contains exactly one even digit and exactly one odd digit from a(n-1), and no digit in a(n) is repeated.

%C The terms sorted in increasing order give A309539.

%e a(2)=102: a(2) is not 100 (since zero would be repeated), nor 101 (since 1 would be repeated).

%Y Cf. A184992, A318700, A309390, A309539, A076654.

%K nonn,base,fini

%O 1,1

%A _Enrique Navarrete_, Aug 06 2019