A248887 Primes p of the form 4m^2+1 such that q=4p^2+1 and r=4q^2+1 are prime.

677, 6635777, 28132417, 156400037, 234518597, 381655297, 386751557, 403849217, 820020497, 1215498497, 1298449157, 1539463697, 1580539537, 1839037457, 2072616677, 2774550277, 2969814017, 6147500837, 6194319617, 6703351877, 6937890437