cp's OEIS Frontend

A139327 Write the first n^2 odd numbers consecutively in n rows of length n: a(n) = maximal number of primes in a row.

%I A139327 #3 Mar 30 2012 18:51:00
%S A139327 0,2,2,3,4,4,5,5,6,7,7,8,8,8,9,10,10,10,11,11,12,13,13,14,14,14,15,15,
%T A139327 15,16,17,17,17,18,18,19,20,20,20,21,21,22,22,22,23,23,23,23,24,24,25,
%U A139327 26,26,27,28,28,29,29,29,29,29,29,29,30,30,31,31,31,32,33,33,33,33,33
%N A139327 Write the first n^2 odd numbers consecutively in n rows of length n: a(n) = maximal number of primes in a row.
%C A139327 a(n) = Max{A139325(n,k): 1<=k<=n}.
%e A139327 a(4)=Max{#{3,5,7},#{11,13},#{17,19,23},#{29,31}}=Max{3,2,3,2}=3:
%e A139327 ..1 ...3 ...5 ...7 ... primes in first row = {3,5,7},
%e A139327 ..9 ..11 ..13 ..15 ... primes in 2nd row = {11,13},
%e A139327 .17 ..19 ..21 ..23 ... primes in 3rd row = {17,19},
%e A139327 .25 ..27 ..29 ..31 ... primes in 4th row = {29,31}.
%Y A139327 Cf. A139326.
%K A139327 nonn
%O A139327 1,2
%A A139327 _Reinhard Zumkeller_, Apr 14 2008