Isolated primes in A381019.

Terms

a(0) =7643a(1) =26357a(2) =31643a(3) =73517a(4) =114073a(5) =240263a(6) =272347a(7) =635821a(8) =1719491a(9) =2981159a(10) =3610597a(11) =4783469a(12) =5294351a(13) =7140083a(14) =7170769a(15) =9813593a(16) =12521141a(17) =13172477a(18) =20443837a(19) =22499627a(20) =24098573a(21) =24147133a(22) =24891641a(23) =50832209a(24) =57741727a(25) =60328483a(26) =65714459a(27) =84701363a(28) =128297069