login
Sum of prime(n) and number of numbers from this set less than n-th nonprime number (A018252(n)).
0

%I #4 Jan 09 2015 15:46:33

%S 2,5,8,11,15,17,22,25,29,35,38,45,49,51,56,62,68,70,76,81,84,90,94,

%T 100,108,113,115,119,122,127,141,145,152,154,164,166,172,179,183,189,

%U 195,197,208,211,215,217,229,241,246,248

%N Sum of prime(n) and number of numbers from this set less than n-th nonprime number (A018252(n)).

%C a(n) = Sum of n-th nonprime number (A018252(n)) and number of numbers from this set less than n-th prime (A000040(n)).

%F a(n) = prime(n) + A073425(n-1) = A018252(n) + A014689(n) = prime(n) + A018252(n)- n = prime(n) + A002808(n) - n.

%K nonn,uned

%O 1,1

%A _Jaroslav Krizek_, Jul 23 2009