Number of primes < square root of n!.

Terms

a(0) =0a(1) =0a(2) =1a(3) =2a(4) =4a(5) =9a(6) =19a(7) =46a(8) =110a(9) =291a(10) =822a(11) =2455a(12) =7740a(13) =25635a(14) =88849a(15) =320749a(16) =1202674a(17) =4670156a(18) =18741145a(19) =77553119a(20) =330321299a(21) =1445829174a(22) =6493985903a(23) =29891948760a(24) =140843699641a(25) =678576973614