Number of primes <= n-th Lucas number.

Terms

a(0) =1a(1) =0a(2) =2a(3) =2a(4) =4a(5) =5a(6) =7a(7) =10a(8) =15a(9) =21a(10) =30a(11) =46a(12) =66a(13) =98a(14) =146a(15) =218a(16) =329a(17) =500a(18) =757a(19) =1158a(20) =1766a(21) =2716a(22) =4164a(23) =6420a(24) =9907a(25) =15320a(26) =23760a(27) =36878a(28) =57356a(29) =89288