This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A082242 #4 Jun 16 2023 17:34:11 %S A082242 3456,9101112,13141516,17181920,21222324,25262728,29303132,33343536, %T A082242 37383940,41424344,45464748,49505152,53545556,57585960,61626364, %U A082242 65666768,69707172,73747576,77787980,81828384,85868788,89909192,93949596,979899100,101102103104 %N A082242 Multiples of 4 that are the concatenation of 4 consecutive natural numbers. %C A082242 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. %t A082242 Select[FromDigits[Flatten[IntegerDigits[#]]]&/@Partition[Range[100],4,1],Mod[#,4]==0&] (* _Harvey P. Dale_, Jun 16 2023 *) %Y A082242 Cf. A082243. %K A082242 base,easy,nonn %O A082242 1,1 %A A082242 _Amarnath Murthy_, Apr 11 2003 %E A082242 More terms from _Harvey P. Dale_, Jun 16 2023