Numbers k such that the numerator of the Bernoulli number B(2k) ends with the digits 691.

Terms

a(0) =6a(1) =21a(2) =27a(3) =321a(4) =1266a(5) =1527a(6) =1821a(7) =2526a(8) =2576a(9) =2721a(10) =2950a(11) =3126a(12) =3246a(13) =3426a(14) =4206a(15) =4236a(16) =4821a(17) =4926a(18) =5286a(19) =5721a(20) =5946a(21) =5950a(22) =6100a(23) =6351a(24) =7018a(25) =7138a(26) =7172a(27) =7386a(28) =7806a(29) =7931