Denominators of primes-only best approximates (POBAs) to e; see Comments.

Terms

a(0) =2a(1) =2a(2) =5a(3) =7a(4) =71a(5) =2591a(6) =2797a(7) =4139a(8) =5573a(9) =5651a(10) =6361a(11) =8867a(12) =17159a(13) =18089a(14) =1126523a(15) =1869173a(16) =3120317a(17) =3245939a(18) =8341961a(19) =23302423a(20) =24681191a(21) =26349383a(22) =52372163a(23) =81514259a(24) =89910487a(25) =157461181a(26) =475992263a(27) =583892083a(28) =770930497a(29) =1184975581