A127421 & A001704

[zak seidov]

A127421  is a (wrong?) version of A001704  (?),
Zak

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A001704  {n,n+1}.    
 12, 23, 34, 45, 56, 67, 78, 89, 910, 1011, 1112 

A127421  Numbers whose decimal expansion is a
concatenation of 2 consecutive increasing numbers.    
 1, 12, 23, 34, 45, 56, 67, 78, 89, 910, 1011, 1112

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