Numbers k such that the number of primes <= k is equal to the sum of primes from the smallest prime factor of k to the largest prime factor of k.
A074210
Numbers k such that the number of primes <= k is equal to the sum of primes from the smallest prime factor of k to the largest prime factor of k.
Terms
- a(0) =1a(1) =4a(2) =12a(3) =30a(4) =272a(5) =4717a(6) =5402a(7) =18487a(8) =20115a(9) =28372a(10) =33998a(11) =111040a(12) =115170a(13) =456975a(14) =821586a(15) =1874660a(16) =4029676a(17) =4060029a(18) =59497900a(19) =232668002a(20) =313128068a(21) =529436220
External references
- oeis: A074210