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A180432
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Start with 3. If a, b in sequence, so is ab+1.
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0
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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
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OFFSET
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1,1
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COMMENTS
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The difference between any two terms is == 0 (mod 7).
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LINKS
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MATHEMATICA
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f[s_List] := Select[ Union@ Join[s, Union[1 + Times @@@ Subsets[ Join[s, s], {2}]]], # < 10000 &]; Nest[f, {3}, 8]
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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