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A255724 List of numbers such that no number, nor its reverse, is in the concatenation of all previous terms. 0
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..49.

EXAMPLE

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.

PROG

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

CROSSREFS

Cf. A048991.

Sequence in context: A206551 A247762 A107909 * A285100 A067340 A263837

Adjacent sequences:  A255721 A255722 A255723 * A255725 A255726 A255727

KEYWORD

nonn,base,easy

AUTHOR

Phil Carmody, Mar 19 2015

STATUS

approved

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Last modified July 17 08:42 EDT 2019. Contains 325098 sequences. (Running on oeis4.)