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A088239 Triangle read by rows: T(n,k) = number of primes not less than n-k and not greater n+k, 0<=k<n. 0

%I

%S 0,1,2,1,2,3,0,2,3,4,1,1,3,4,4,0,2,2,3,4,5,1,1,2,2,4,5,6,0,1,1,3,3,5,

%T 6,6,0,0,2,2,4,4,5,6,7,0,1,1,3,3,4,4,6,7,8,1,1,2,2,3,3,5,5,7,8,8,0,2,

%U 2,2,2,4,4,6,6,7,8,9,1,1,2,2,3,3,5,5,6,6,8,9,9,0,1,1,3,3,4,4,5,5,7,7

%N Triangle read by rows: T(n,k) = number of primes not less than n-k and not greater n+k, 0<=k<n.

%C T(n,0) = A010051(n); T(n,n-1) = A000720(2*n-1).

%K nonn,tabl

%O 1,3

%A _Reinhard Zumkeller_, Nov 03 2003

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Last modified August 11 09:30 EDT 2020. Contains 336423 sequences. (Running on oeis4.)