The least semiprime (A001358) such that between it and the next n semiprimes, but not the next n+1 semiprimes, there are no primes.
A228170
The least semiprime (A001358) such that between it and the next n semiprimes, but not the next n+1 semiprimes, there are no primes.
Terms
- a(0) =9a(1) =33a(2) =91a(3) =141a(4) =115a(5) =213a(6) =1382a(7) =1639a(8) =1133a(9) =2558a(10) =2973a(11) =1329a(12) =15685a(13) =16143a(14) =9974a(15) =35678a(16) =34063a(17) =43333a(18) =19613a(19) =107381a(20) =162145a(21) =44294a(22) =404599a(23) =461722a(24) =838259a(25) =155923a(26) =535403a(27) =492117a(28) =396737a(29) =2181739
External references
- oeis: A228170