Smallest even number k such that lpf(k-3) = prime(n) while lpf(k-1) > lpf(k-3), where lpf=least prime factor (A020639).

A242490

Smallest even number k such that lpf(k-3) = prime(n) while lpf(k-1) > lpf(k-3), where lpf=least prime factor (A020639).

Terms

    a(0) =6a(1) =8a(2) =80a(3) =14a(4) =224a(5) =20a(6) =440a(7) =854a(8) =32a(9) =1460a(10) =1742a(11) =44a(12) =2282a(13) =3434a(14) =4190a(15) =62a(16) =5432a(17) =4760a(18) =74a(19) =12194a(20) =8930a(21) =8054a(22) =12374a(23) =13292a(24) =104a(25) =15350a(26) =110a(27) =14282a(28) =31982a(29) =17402

External references