A167920 Smallest single or isolated number == 1 (mod n).
2, 23, 4, 37, 6, 37, 113, 89, 37, 131, 12, 37, 53, 113, 211, 97, 18, 37, 457, 401, 127, 23, 47, 97, 251, 53, 163, 113, 30, 211, 373, 97, 67, 307, 211, 37, 223, 457, 79, 401, 42, 127, 173, 89, 541, 47, 941, 97, 491, 251, 307, 53, 743, 163, 331, 113, 457, 233, 60, 541
Offset: 1
Keywords
Examples
For n = 72, the smallest single or isolated number in the sequence 1, 73, 145, 217, 289, 361, 433, 505, 577, ... is 577, so a(72) = 577.
Extensions
Corrected (a(2) replaced by 23, a(3) inserted, 113 replaced by 97, 337 by 97, 257 by 97 etc.) by R. J. Mathar, May 30 2010