Long legs of primitive Pythagorean triples (a,b,c) for which 2a+1, 2b+1 and 2c+1 are primes.

Terms

a(0) =21a(1) =56a(2) =285a(3) =483a(4) =783a(5) =999a(6) =1269a(7) =1593a(8) =1911a(9) =2613a(10) =3003a(11) =3596a(12) =3621a(13) =3740a(14) =4136a(15) =4233a(16) =4928a(17) =5096a(18) =5451a(19) =5828a(20) =5840a(21) =6320a(22) =7040a(23) =7280a(24) =8036a(25) =8468a(26) =9021a(27) =9296a(28) =9591a(29) =11660