Primes of the form 2^a * 5^b * 7^c + 1 for positive a, b, c.

Terms

a(0) =71a(1) =281a(2) =491a(3) =701a(4) =2801a(5) =4481a(6) =7001a(7) =7841a(8) =12251a(9) =13721a(10) =17921a(11) =28001a(12) =34301a(13) =54881a(14) =70001a(15) =78401a(16) =85751a(17) =122501a(18) =125441a(19) =137201a(20) =168071a(21) =240101a(22) =280001a(23) =286721a(24) =437501a(25) =490001