Beginnings of maximal chains of primes with six members (five links).

Terms

a(0) =417037a(1) =736013a(2) =1006007a(3) =1563539a(4) =13884217a(5) =13893713a(6) =20014021a(7) =22037297a(8) =22583789a(9) =23496349a(10) =26531251a(11) =26864017a(12) =27754471a(13) =38767909a(14) =41133299a(15) =41383343a(16) =43509359a(17) =45085321a(18) =48619393a(19) =49243343a(20) =51082139a(21) =52754543