A123383 - OEIS

%I #12 Apr 10 2024 03:31:31

%S 1,2,6,14,42,44,47,50,118,119,178,223,367,438,872,1378,2076,2352,4195,

%T 5090,15905,17454

%N Numbers k such that 10*(11*10^k-1) + 3 is prime or PRP.

%C a(16)-a(19) were computed with PFGW.exe.

%o (PARI) g(n,m=3) = for(x=1,n,y=10*(11*10^x-1)+m;if(ispseudoprime(y),print1(x", ")))

%K nonn,more

%O 1,2

%A _Cino Hilliard_, Oct 13 2006

%E a(20)-a(22) from _Michael S. Branicky_, Apr 08 2024