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 A067463 #14 Apr 24 2025 01:39:29 %S A067463 5,13,19,23,29,37,41,43,53,59,61,67,83,101,103,113,131,149,157,163, %T A067463 167,193,223,227,229,239,263,271,281,283,293,311,313,331,347,349,373, %U A067463 397,401,433,461,467,491,503,523,563,571,599,601,607,631,643,653,661,683 %N A067463 Primes p such that p+sigma(p+1) is prime. %H A067463 Amiram Eldar, <a href="/A067463/b067463.txt">Table of n, a(n) for n = 1..10000</a> %t A067463 Select[Prime[Range[124]], PrimeQ[# + DivisorSigma[1, #+1]] &] (* _Amiram Eldar_, Apr 24 2025 *) %o A067463 (PARI) isok(p) = isprime(p) && isprime(p+sigma(p+1)); \\ _Michel Marcus_, Feb 17 2021 %Y A067463 Cf. A008333, A067464. %K A067463 easy,nonn %O A067463 1,1 %A A067463 _Benoit Cloitre_, Feb 23 2002