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A098784 Smallest number not occurring earlier such that the concatenation of the numbers has the property that the first two digits sum to 10, the next two to 10, the next two to 10, the next two to 10, etc. 0

%I

%S 1,9,2,8,3,7,4,6,5,51,91,92,81,93,71,94,61,95,52,82,83,72,84,62,85,53,

%T 73,74,63,75,54,64,65,55,56,41,96,42,86,43,76,44,66,45,57,31,97,32,87,

%U 33,77,34,67,35,58,21,98,22,88,23,78,24,68,25,59,11,99,12,89,13,79,14

%N Smallest number not occurring earlier such that the concatenation of the numbers has the property that the first two digits sum to 10, the next two to 10, the next two to 10, the next two to 10, etc.

%K base,easy,nonn

%O 1,2

%A _Eric Angelini_, Oct 04 2004

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Last modified December 9 06:07 EST 2021. Contains 349627 sequences. (Running on oeis4.)