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 A181680 #12 May 29 2024 18:36:05 %S A181680 7224839,9339119,10780559,42464519,45652319,53464319,62198639, %T A181680 69899759,94159799,121136399,130777919,158608799,191010959,285785639, %U A181680 288308159,322461719,353256119,402411239,423803519 %N A181680 Primes p such that (p-1)/2, (p-2)/3, (p-3)/4, (p-4)/5 and (p-5)/6 are prime numbers. %t A181680 Select[Prime[Range[20000000]],PrimeQ[(#-1)/2]&&PrimeQ[(#-2)/3]&&PrimeQ[(#-3)/4]&&PrimeQ[(#-4)/5]&&PrimeQ[(#-5)/6]&] %t A181680 Select[Prime[Range[2254*10^4]],AllTrue[(#-Range[5])/Range[2,6],PrimeQ]&] (* _Harvey P. Dale_, May 29 2024 *) %Y A181680 Cf. A093554. %K A181680 nonn %O A181680 1,1 %A A181680 _Vladimir Joseph Stephan Orlovsky_, Nov 17 2010 %E A181680 Edited, terms checked and two terms added by _Klaus Brockhaus_, Nov 17 2010