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 A053823 #7 Jan 16 2022 22:09:38 %S A053823 2,111546435,10334565887047481278774629361, %T A053823 36134787795296163821030157447828794735407577182650673, %U A053823 83897624105100872650777504146410004512537400341032979607327005665751086721210969 %N A053823 Product of primes in n-th shell of prime spiral. %C A053823 Write primes in a spiral: the first shell contains a single prime, 2. The next shell contains 8 primes, etc. %e A053823 a(2)=3*5*7*11*13*17*19*23=111546435, the product of the 2nd through 9th primes. %Y A053823 Cf. A053997, A053998, A053999. %K A053823 easy,nonn %O A053823 0,1 %A A053823 _Enoch Haga_, Apr 06 2000 %E A053823 a(5) corrected by _Sean A. Irvine_, Jan 16 2022