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 A077180 #9 May 09 2025 17:33:55
%S A077180 12,12,12345,1234567891011
%N A077180 Smallest concatenation of integers starting from 1 that is a multiple of the n-th prime.
%C A077180 The next term (a(5)) has 210 digits. - _Harvey P. Dale_, Aug 15 2022
%t A077180 sci[p_]:=Module[{k=2},While[!Divisible[FromDigits[Flatten[IntegerDigits/@ Range[ k]]],p],k++];FromDigits[Flatten[IntegerDigits/@Range[k]]]]; sci/@Prime[ Range[ 5]] (* _Harvey P. Dale_, Aug 15 2022 *)
%Y A077180 Cf. A007908, A077181, A077182.
%K A077180 base,nonn
%O A077180 1,1
%A A077180 _Amarnath Murthy_, Nov 01 2002
%E A077180 Next term is too large to include, but may be deduced from A077182. - _Sascha Kurz_, Jan 30 2003
%E A077180 Corrected by _Sascha Kurz_, Jan 30 2003