Numbers n such that m=(n^2+1)/2, p=(m^2+1)/2, q=(p^2+1)/2, and r=(q^2+1)/2 are all prime.

Terms

a(0) =4949a(1) =6051a(2) =169219a(3) =183241a(4) =560769a(5) =1113621a(6) =1306689a(7) =1370269a(8) =1421869a(9) =1485561a(10) =1640711a(11) =1730709a(12) =1876351a(13) =1967769a(14) =2147661a(15) =2217351a(16) =2293939a(17) =2428461a(18) =2440871a(19) =3346661a(20) =3625139a(21) =3625889a(22) =3763969a(23) =3991209a(24) =4020711a(25) =4728141a(26) =5219691a(27) =5547221a(28) =5554939a(29) =5965699