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A308609 Lexicographically earliest sequence of distinct terms such that a(n) is divisible by five and only five digits of a(n+1). 1

%I #7 Jun 11 2019 06:24:16

%S 1,11111,101111,110111,111011,111101,111110,11112,11113,111112,11114,

%T 11121,11131,111113,111114,11116,11117,111115,11115,11119,111116,

%U 11122,11211,11133,11139,11311,111117,11313,11191,111118,11127,11331,11193,11137,11171,111119,111121,111131,111141,11199,11333,11177,111151,111161,111171,13111

%N Lexicographically earliest sequence of distinct terms such that a(n) is divisible by five and only five digits of a(n+1).

%H Carole Dubois, <a href="/A308609/b308609.txt">Table of n, a(n) for n = 1..3494</a>

%e The sequence starts with 1,11111,101111,110111,111011,111101,111110,11112,11113,... and we see indeed that a(2) = 11111 is the smallest available integer showing five digits that divide a(1) = 1; in the same manner we have a(3) = 101111 [the five 1s divide a(2) = 11111], a(4) = 110111 [the five 1s divide a(3) = 101111], a(8) = 11112 [all five digits divide a(7) = 111110], a(9) = 11113 [all five digits divide a(8) = 11112], etc.

%Y Cf. A326106 [a(n) is not divisible by any digit of a(n+1)], A326107 [a(n) is divisible by one and only one digit of a(n+1)], A326108 [a(n) is divisible by two and only two digits of a(n+1)], A326109 [a(n) is divisible by three and only three digits of a(n+1)] and A326110 [a(n) is divisible by four and only four digits of a(n+1)].

%K base,nonn

%O 1,2

%A _Eric Angelini_ and _Carole Dubois_, Jun 10 2019

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