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 A180432 Start with 3. If a, b in sequence, so is ab+1. 0
 3, 10, 31, 94, 101, 283, 304, 311, 850, 913, 934, 941, 962, 1011, 2551, 2740, 2803, 2824, 2831, 2887, 2915, 3034, 3041, 3111, 3132, 7654, 8221, 8410, 8473, 8494, 8501, 8662, 8746, 8774, 8837, 9103, 9124, 9131, 9334, 9341, 9397, 9411, 9425, 9495, 9621 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The difference between any two terms is == 0 (mod 7). LINKS Table of n, a(n) for n=1..45. MATHEMATICA f[s_List] := Select[ Union@ Join[s, Union[1 + Times @@@ Subsets[ Join[s, s], {2}]]], # < 10000 &]; Nest[f, {3}, 8] CROSSREFS Cf. A009293. Sequence in context: A212031 A339032 A033121 * A237930 A192337 A106517 Adjacent sequences: A180429 A180430 A180431 * A180433 A180434 A180435 KEYWORD nonn AUTHOR Robert G. Wilson v, Sep 04 2010 STATUS approved

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Last modified February 24 04:32 EST 2024. Contains 370288 sequences. (Running on oeis4.)