A108511 - OEIS

%I #11 Aug 09 2021 08:45:56

%S 0,2,1,0,70,182,440,1053,0,6458,0,40087,0,251737,637320,1617173,

%T 4124466,10553445,27067100,69709705,179992910,465769811,0,3140421738,

%U 8179002128,21338685403,0,0,382465573528,0,0,6935812012545,18262325820324,0,0,335276334036937

%N a(n) is the smallest number m such that prime(m) = n*m - 1, or 0 if no such m exists.

%C A108512(n) gives number of solutions of the equation prime(x) = n*x - 1.

%e a(26) = 21338685403 because prime(21338685403) = 26*21338685403 - 1 and 21338685403 is the smallest (only) number m with this property.

%Y Cf. A108512, A108514.

%K nonn

%O 1,2

%A _Farideh Firoozbakht_, Jun 12 2005

%E a(29)-a(33) from _Donovan Johnson_, Nov 15 2009

%E a(34)-a(36) from _Jinyuan Wang_, Aug 09 2021