Number of proper prime powers (in A246547) that do not exceed primorial A002110(n).

A380402

Number of proper prime powers (in A246547) that do not exceed primorial A002110(n).

Terms

    a(0) =0a(1) =0a(2) =1a(3) =6a(4) =14a(5) =34a(6) =75a(7) =187a(8) =551a(9) =1954a(10) =8317a(11) =38582a(12) =200978a(13) =1125541a(14) =6562122a(15) =40444003a(16) =266832233a(17) =1870169623a(18) =13424553758a(19) =101495825622a(20) =793832121165

External references