Primes that divide some k dividing 4^k + 3^k (A045584).

Terms

a(0) =7a(1) =379a(2) =14407a(3) =689431a(4) =4235659a(5) =41647747a(6) =137534083a(7) =239900179a(8) =242121643a(9) =349909477a(10) =1245283747a(11) =1478065891a(12) =1605314383a(13) =2500276549a(14) =2748751303a(15) =5618210347a(16) =7490947129a(17) =11236420693a(18) =11260421089a(19) =16948514941a(20) =29440659361a(21) =74163546829a(22) =75093609319a(23) =82188727303