OFFSET
1,1
COMMENTS
Except for the first term all the other terms are a concatenation of 4 numbers from 4k+1 to 4k+4. All the natural numbers are used except 1,2,7 and 8.
MATHEMATICA
Select[FromDigits[Flatten[IntegerDigits[#]]]&/@Partition[Range[100], 4, 1], Mod[#, 4]==0&] (* Harvey P. Dale, Jun 16 2023 *)
CROSSREFS
KEYWORD
base,easy,nonn
AUTHOR
Amarnath Murthy, Apr 11 2003
EXTENSIONS
More terms from Harvey P. Dale, Jun 16 2023
STATUS
approved