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 A163081 #9 May 08 2020 17:49:27 %S A163081 3,7,31,4808643121,483701705079089804581, %T A163081 3283733939424401442167506310317720418331001 %N A163081 Primes of the form p$ + 1 where p is prime, where '$' denotes the swinging factorial (A056040). %C A163081 The values of p are 2, 3, 5, 31, 67, 139 which is A163079. Subsequence of A163075 (primes of the form k$ + 1). %H A163081 Jinyuan Wang, <a href="/A163081/b163081.txt">Table of n, a(n) for n = 1..7</a> %H A163081 Peter Luschny, <a href="/A180000/a180000.pdf">Die schwingende Fakultät und Orbitalsysteme</a>, August 2011. %H A163081 Peter Luschny, <a href="http://www.luschny.de/math/primes/SwingingPrimes.html"> Swinging Primes.</a> %e A163081 3 and 3$ + 1 = 7 are prime, so 7 is a member. %p A163081 a := proc(n) select(isprime,[$2..n]); select(isprime, map(x -> A056040(x)+1,%)) end: %Y A163081 Cf. A056040, A103319, A163074-A163083. %K A163081 nonn %O A163081 1,1 %A A163081 _Peter Luschny_, Jul 21 2009