Primes p such that 2*p + 1 is also prime and p + 1 is a highly composite number (definition 1).
A214873
Primes p such that 2*p + 1 is also prime and p + 1 is a highly composite number (definition 1).
Terms
- a(0) =3a(1) =5a(2) =11a(3) =23a(4) =179a(5) =239a(6) =359a(7) =719a(8) =5039a(9) =55439a(10) =665279a(11) =6486479a(12) =32432399a(13) =698377679a(14) =735134399a(15) =1102701599a(16) =20951330399
External references
- oeis: A214873