A090911 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; and (3) |k-a(n)| is not the absolute difference of two previous consecutive members of the sequence.

1, 3, 6, 1, 8, 45, 2, 789, 56, 3, 34, 5, 78, 7, 234, 1, 12, 1213, 456, 7, 1314, 23, 4, 45, 1516, 5, 234, 23, 6, 67, 8, 345, 34, 123, 56, 9, 1112, 3, 910, 23, 456, 67, 234, 1415, 6, 89, 456, 2345, 4, 567, 1718, 9, 2122, 23, 1516, 89, 910, 1011, 2, 2223, 10111012, 1415

Offset

0,2

Links

Table of n, a(n) for n=0..61.

Crossrefs

Cf. A090910, A090913.

Sequence in context: A176092 A118012 A022836 * A198491 A336245 A108813

Adjacent sequences: A090908 A090909 A090910 * A090912 A090913 A090914

Keyword

base,nonn,easy

Author

Amarnath Murthy, Dec 15 2003

Extensions

Edited and extended by David Wasserman, Feb 14 2006

Status

approved