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 A107312 #24 Mar 03 2025 17:45:12 %S A107312 3,5,17,137,347,827,2087,2687,3557,3917,4517,4967,5477,5657,5867,6827, %T A107312 7457,7547,7877,8087,8537,8597,10037,10427,10937,12107,12377,13397, %U A107312 13877,16067,17837,17987,19427,19697,20507,20717,20807,22367,22637 %N A107312 Primes p such that p + 2 and p^2 + 2^2 are primes. %C A107312 Primes are lesser twins. Except a(1) and a(2), all a(n) == 7(mod 10). %H A107312 Edward Jiang, <a href="/A107312/b107312.txt">Table of n, a(n) for n = 1..1000</a> %p A107312 select(p -> isprime(p) and isprime(p+2) and isprime(p^2+4), [seq(2*i+1,i=1..10000)]); # _Robert Israel_, Aug 11 2014 %t A107312 Select[Prime[Range[3000]], PrimeQ[ #+2]&&PrimeQ[ #^2+4]&] %o A107312 (Magma) [p: p in PrimesUpTo(25000)| IsPrime(p+2) and IsPrime(p^2+4)]; // _Vincenzo Librandi_, Jan 29 2011 %o A107312 (PARI) a(n)=isprime(n) && isprime(n+2) && isprime(n^2+4) \\ _Edward Jiang_, Aug 08 2014 %Y A107312 Cf. A045637. %K A107312 nonn %O A107312 1,1 %A A107312 _Zak Seidov_, May 21 2005