Largest prime <= n in any decomposition of 2n into a sum of two odd primes.

Terms

a(0) =3a(1) =3a(2) =5a(3) =5a(4) =7a(5) =5a(6) =7a(7) =7a(8) =11a(9) =11a(10) =13a(11) =11a(12) =13a(13) =13a(14) =17a(15) =17a(16) =19a(17) =17a(18) =19a(19) =13a(20) =23a(21) =19a(22) =19a(23) =23a(24) =23a(25) =19a(26) =29a(27) =29a(28) =31a(29) =23