# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a374104 Showing 1-1 of 1 %I A374104 #17 Jul 23 2024 21:40:19 %S A374104 4,4,7,4,9,9,5,4,7,5,15,9,4,7,4,4,21,9,9,5,5,4,7,9,9,4,7,7,33,5,5,4,7, %T A374104 9,9,9,4,5,4,5,45,9,4,4,4,9,9,9,5,5,5,4,4,9,4,7,4,5,63,5,9,7,5,4,9,4, %U A374104 4,9,4,7,75,9,4,4,4,5,9,9,5,5,7,4,15,9,4,4,4,4,9,5,5,9 %N A374104 a(n) = A075860(A075860(n) + 2) + 2. %C A374104 (p,p+2) is a twin prime pair if and only if a(p)=p+4. %C A374104 For all positive integers n, there exists a positive integer m such that a(n)