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 A276105 Lexicographically first sequence (with no duplicate term) where all the digits "2" are separated by two digits. 0
 1, 2, 3, 4, 20, 5, 21, 6, 23, 7, 24, 8, 25, 9, 26, 12, 10, 27, 32, 11, 28, 42, 13, 29, 52, 14, 200, 201, 203, 204, 205, 206, 207, 208, 209, 210, 211, 213, 214, 215, 216, 217, 218, 219, 230, 231, 233, 234, 235, 236, 237, 238, 239, 240, 241, 243, 244, 245, 246, 247, 248, 249 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS The sequence is started with a(1)=1 and always extended with the smallest integer not yet used that does not lead to a contradiction. LINKS EXAMPLE To match the infinite digit-pattern 2..2..2..2..2..2.. (etc.) one must use the integer 20 after the fourth term (which is 4), then use the integer 5, then use the integer 21, then use the integer 6, then use the integer 23 (as 22 is forbidden: no integer with consecutive 2's is allowed), etc. CROSSREFS Sequence in context: A058772 A227941 A250259 * A247574 A169901 A012285 Adjacent sequences:  A276102 A276103 A276104 * A276106 A276107 A276108 KEYWORD nonn,base AUTHOR Eric Angelini, Aug 18 2016 STATUS approved

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Last modified September 25 13:37 EDT 2021. Contains 347654 sequences. (Running on oeis4.)