a(n) is the least prime p such that there are exactly n primes of the form p+d where d is a divisor of p-1 or of p+1.

A340160

a(n) is the least prime p such that there are exactly n primes of the form p+d where d is a divisor of p-1 or of p+1.

Terms

    a(0) =283a(1) =43a(2) =2a(3) =11a(4) =31a(5) =71a(6) =167a(7) =179a(8) =601a(9) =359a(10) =419a(11) =1439a(12) =1559a(13) =3359a(14) =7559a(15) =6047a(16) =5039a(17) =13679a(18) =21001a(19) =13441a(20) =20161a(21) =45361a(22) =15121a(23) =10079a(24) =54001a(25) =41579a(26) =35281a(27) =92399a(28) =99793a(29) =92401

External references