Numbers k such that the number of primes between k and 2k (inclusive) = largest prime factor of k.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =9a(5) =28a(6) =65a(7) =114a(8) =174a(9) =186a(10) =246a(11) =623a(12) =1784a(13) =1832a(14) =1912a(15) =5121a(16) =13810a(17) =14090a(18) =39413a(19) =40403a(20) =808822a(21) =809858a(22) =810026a(23) =2201505a(24) =2202735a(25) =6047408a(26) =6048656a(27) =16463939a(28) =16467271a(29) =16472371