Numbers k such that tau(k) and tau(k+2) are both prime, where tau is the number of divisors function (the lesser of twin prime pairs are excluded).

A343495

Numbers k such that tau(k) and tau(k+2) are both prime, where tau is the number of divisors function (the lesser of twin prime pairs are excluded).

Terms

    a(0) =2a(1) =7a(2) =9a(3) =23a(4) =47a(5) =79a(6) =81a(7) =167a(8) =359a(9) =727a(10) =839a(11) =1367a(12) =1847a(13) =2207a(14) =2399a(15) =3719a(16) =5039a(17) =7919a(18) =10607a(19) =11447a(20) =14639a(21) =16127a(22) =17159a(23) =19319a(24) =28559a(25) =29927a(26) =36479a(27) =44519a(28) =49727a(29) =54287

External references