Indices of primes followed by a gap (distance to next larger prime) of 40.

Terms

a(0) =2191a(1) =2344a(2) =2524a(3) =2788a(4) =3562a(5) =4058a(6) =4677a(7) =5030a(8) =5349a(9) =6076a(10) =6145a(11) =6256a(12) =6320a(13) =6442a(14) =6454a(15) =6902a(16) =7232a(17) =7488a(18) =8119a(19) =8152a(20) =8245a(21) =8366a(22) =8553a(23) =8567a(24) =8591a(25) =8746a(26) =9260a(27) =9361a(28) =10536a(29) =10735