Primes of the form 2^r*7^s + 1.

Terms

a(0) =2a(1) =3a(2) =5a(3) =17a(4) =29a(5) =113a(6) =197a(7) =257a(8) =449a(9) =1373a(10) =3137a(11) =50177a(12) =65537a(13) =114689a(14) =268913a(15) =470597a(16) =614657a(17) =1075649a(18) =3294173a(19) =7340033a(20) =9834497a(21) =210827009a(22) =275365889a(23) =359661569a(24) =469762049a(25) =1129900997a(26) =1438646273a(27) =1927561217a(28) =7909306973a(29) =52613349377