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A167920
Smallest single or isolated number == 1 (mod n).
0
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
1,1
EXAMPLE
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.
CROSSREFS
Sequence in context: A162711 A120713 A309154 * A237579 A104644 A158992
KEYWORD
nonn
AUTHOR
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
STATUS
approved