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Set of all 9-digit numbers in which every pair of adjacent digit is a multiple of either of 2 distinct 2-digit numbers.
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%I #5 Dec 23 2021 09:33:29

%S 923468517,195763842,219576384,384219576,421957638,576384219,

%T 638421957,763842195,842195763,957638421

%N Set of all 9-digit numbers in which every pair of adjacent digit is a multiple of either of 2 distinct 2-digit numbers.

%H Puzzleup, <a href="http://www.puzzleup.com">Home page</a>

%e 195763842 and all its cyclically shifted versions are multiples of either 19 or 21.

%e 923468517 is formed from 23 or 17 because 92 = 23*4, 34 = 17*2, and so on.

%K nonn,base

%O 1,1

%A Balakrishnan (bvarada2(AT)jhu.edu), Sep 17 2006