[seqfan] Re: Digit chain
Heinz, Alois
alois.heinz at hs-heilbronn.de
Thu Dec 22 12:57:35 CET 2011
1, 10, 11, 12, 2, 20, 21, 13, 3, 23, 22, 24, 4, 14, 15, 5, 25, 26, 6,
16, 17, 7, 27, 28, 8, 18, 19, 9, 29, 32, 30, 31, 33, 34, 35, 36, 37,
38, 39, 43, 40, 41, 42, 44, 45, 46, 47, 48, 49, 54, 50, 51, 52, 53,
55, 56, 57, 58, 59, 65, 60, 61, 62, 63, 64, 66, 67, 68, 69, 76, 70,
71, 72, 73, 74, 75, 77, 78, 79, 87, 80, 81, 82, 83, 84, 85, 86, 88,
89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 109
almost the same as A107353.
Alois
Am 22.12.2011 12:33, schrieb Eric Angelini:
> Hello SeqFans,
> if S is of interest, could please someone check, extend and submit to the OEIS?
> Thanks,
> Best,
> É.
>
> -------------------------------------------------
> S = 1,10,11,12,2,20,21,13,3,23,22,24,4,14,15,5,25,...
>
> Lexicographically smallest permutation of the natural numbers such that in decimal representation a(n) shares at least one digit with a(n-1); a(1)=1.
>
> In building S, always choose the smallest term not yet present in S and not leading to a contradiction.
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