id:A090910 - OEIS Search Results

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a(n+1) is the least positive integer k such that 1) k is a one-digit number or the concatenation of two or more consecutive numbers; 2) |k-a(n)| is prime; 3) k is not already in the sequence; and 4) |k-a(n)| is not the absolute difference of two previous consecutive members of the sequence.

+0
4

1, 3, 6, 23, 4, 9, 2, 45, 8, 67, 56, 123, 34, 5, 78, 7, 234, 1415, 1234, 1011, 910, 89, 456, 1213, 12, 2345, 678, 2425, 3456, 1819, 123456, 2627, 45678, 4445, 101112, 3031, 5678, 345, 1516, 789, 1718, 567, 2728, 100101, 2324, 4567, 1314, 891011, 4344 (list; graph; listen)

	OFFSET	`0,2`
	EXAMPLE	`12 follows 23 as 23-12 = 11 is prime.`
	CROSSREFS	`Cf. A090911, A090912.` `Sequence in context: A079514 A049415 A029848 this_sequence A013213 A013217 A013216` `Adjacent sequences: A090907 A090908 A090909 this_sequence A090911 A090912 A090913`
	KEYWORD	`base,nonn,easy`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Dec 15 2003`
	EXTENSIONS	`Edited and extended by David Wasserman (wasserma(AT)spawar.navy.mil), Feb 14 2006`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research