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A137271 Numbers n such that pi(n^2)=pi((n-k)^2)+n, where k=A000193(n). 0

%I #2 Mar 30 2012 18:35:47

%S 2,5,14,17,18,43,44,54,107,121,137,144,417,424,868,990,991,1094,2529,

%T 2586,2740,2741,2785,2878,2948,3085,3176,3267,3269,3346,7319,7694,

%U 7750,7868,7984,8061,8161,8250,8308,8340,21182,22190,22801,23200,57448

%N Numbers n such that pi(n^2)=pi((n-k)^2)+n, where k=A000193(n).

%t Do[k=Round[Log[n]];If[PrimePi[n^2]==PrimePi[(n-k)^2]+n, Print[n]], {n,1,10^5,1}]

%Y Cf. A000193, A000720.

%K nonn

%O 1,1

%A _Manuel Valdivia_, Mar 13 2007

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Last modified June 20 07:26 EDT 2024. Contains 373512 sequences. (Running on oeis4.)