%I #15 Aug 16 2019 00:17:11

%S 3,36,109,5

%N Number of terms in the n-th row of the triangle A324156.

%C The offset is 2 for compatibility with the definition of A324156.

%F a(n) <= A324155(n) - A324154(n) + 1, equality holds for n = 2 and n = 5 (and possibly for further terms).

%e a(2) = 3 since there are 3 numbers m such that number of prime numbers <= m is equal to the number of base-2 zerofree numbers <= m: these are 2, 3, 4 (= row #2 of A324156).

%Y Cf. A324161, A324154, A324155, A324156.

%K hard,nonn,base,more

%O 2,1

%A _Hieronymus Fischer_, Jun 22 2019