A255724 List of numbers such that no number, nor its reverse, is in the concatenation of all previous terms.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 20, 22, 24, 25, 26, 27, 29, 30, 33, 35, 36, 37, 38, 40, 44, 46, 47, 49, 50, 55, 57, 58, 60, 66, 69, 70, 77, 80, 88, 90, 99, 100, 102, 103, 104, 105, 106, 107, 108, 109, 112, 114, 115, 116, 117, 118, 122

Offset: 1

Author

Phil Carmody, Mar 19 2015

Keywords

• nonn
• base
• easy

Examples

			After listing 1..11, 12 is not listed as "12" is found in the concatenated earlier terms. After continuing with 13..18, 19 is not listed as "91" is likewise found.
		

Crossrefs

Cf. A048991.

Programs

PARI

lista(nn) = my(d, v=[]); for(n=1, nn, for(i=0, #v-#d=digits(n), (v[i+1..i+#d]==d || v[i+1..i+#d]==Vecrev(d)) && next(2)); print1(n, ", "); v=concat(v, d)) \\ Jinyuan Wang, Aug 23 2021

Perl

$s="";$=0;do{$++;if(index($s,$)<0 && index($s,reverse)<0){print("$ ");$s.=$_}}while(1);

Extensions

More terms from Jinyuan Wang, Aug 23 2021