The number of squarefree numbers whose largest prime divisor is prime(n) and that are averages of twin prime pairs.

A354950

The number of squarefree numbers whose largest prime divisor is prime(n) and that are averages of twin prime pairs.

Terms

    a(0) =0a(1) =1a(2) =1a(3) =1a(4) =2a(5) =2a(6) =3a(7) =7a(8) =4a(9) =9a(10) =20a(11) =31a(12) =57a(13) =88a(14) =139a(15) =282a(16) =421a(17) =806a(18) =1397a(19) =2572a(20) =4440a(21) =7863a(22) =14580a(23) =26211a(24) =47727a(25) =86929a(26) =159972a(27) =292650a(28) =542477a(29) =1000087

External references