Initial prime in set of 4 consecutive primes with common gap 42.

Terms

a(0) =23921257a(1) =32611897a(2) =33215597a(3) =35650007a(4) =44201617a(5) =49945837a(6) =51616717a(7) =70350487a(8) =70687937a(9) =74816107a(10) =78789707a(11) =86066047a(12) =99641917a(13) =101568287a(14) =129031187a(15) =146922077a(16) =149568217a(17) =151779517a(18) =153921017a(19) =156793337a(20) =162881627