0,1

k sequence in A112880

12*3^2-1=107, 107 and 109 twin primes so a(1)=107

18*107^2-1=206081, 206081 and 206083 twin primes so a(2)=206081

a(3)=492*(18*(12*3^2-1)^2-1)^2-1

a(4)=702*(492*(18*(12*3^2-1)^2-1)^2-1)^2-1

a(5)=2310*(702*(492*(18*(12*3^2-1)^2-1)^2-1)^2-1)^2-1

a(6)=2370*(2310*(702*(492*(18*(12*3^2-1)^2-1)^2-1)^2-1)^2-1)^2-1

a(7)=130650*(2370*(2310*(702*(492*(18*(12*3^2-1)^2-1)^2-1)^2-1)^2-1)^2-1)^2-1

a(8)=980910*(130650*(2370*(2310*(702*(492*(18*(12*3^2-1)^2-1)^2-1)^2-1)^2-1)^2-1)^2-1)^2-1

a(9)=5528418*(980910*(130650*(2370*(2310*(702*(492*(18*(12*3^2-1)^2-1)^2-1)^2-1)^2-1)^2-1)^2-1)^2-1)^2-1

a(10)=21357012*(5528418*(980910*(130650*(2370*(2310*(702*(492*(18*(12*3^2-1)^2-1)^2-1)^2-1)^2-1)^2-1)^2-1)^2-1)^2-1)^2-1

Cf. A112880.

Sequence in context: A003705 A146214 A061308 this_sequence A053861 A041635 A142533

Adjacent sequences: A112876 A112877 A112878 this_sequence A112880 A112881 A112882

hard,nonn

Pierre CAMI (pierrecami(AT)tele2.fr), Oct 01 2005