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Numbers n for which there is an equal number of primes in range [prime(n)^2, prime(n)*prime(n+1)] as there are primes in range [prime(n)*prime(n+1), prime(n+1)^2].
8

%I #7 Mar 30 2015 21:42:30

%S 1,10,14,17,20,90,110,152,176,185,193,230,344,377,391,392,404,441,442,

%T 542,1066,1533,1550,1632,1638,1639,1810,2115,2210,2302,2567,2768,2921,

%U 3172,3518,3615,3764,4357,4577,4787,4853,5060,5278,6329

%N Numbers n for which there is an equal number of primes in range [prime(n)^2, prime(n)*prime(n+1)] as there are primes in range [prime(n)*prime(n+1), prime(n+1)^2].

%o (Scheme, with _Antti Karttunen_'s IntSeq-library)

%o (define A256471 (ZERO-POS 1 1 A256470))

%Y Positions of zeros in A256470.

%Y Cf. A256472, A256473 (the corresponding primes).

%K nonn

%O 1,2

%A _Antti Karttunen_, Mar 30 2015