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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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS EXAMPLE If n=72, the smallest single or isolated number in the sequence 73, 145, 217, 289, 361, 433, 505, 577, so a(72)=577. CROSSREFS Cf. A034694, A167706. Sequence in context: A245628 A162711 A120713 * A237579 A104644 A158992 Adjacent sequences:  A167917 A167918 A167919 * A167921 A167922 A167923 KEYWORD nonn AUTHOR Juri-Stepan Gerasimov, Nov 15 2009 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

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Last modified June 18 18:52 EDT 2019. Contains 324215 sequences. (Running on oeis4.)