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

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, 15, 16, 17, 17, 17, 18, 18, 19, 20, 20, 20, 21, 21, 22, 22, 22, 23, 23, 23, 23, 24, 24, 25, 26, 26, 27, 28, 28, 29, 29, 29, 29, 29, 29, 29, 30, 30, 31, 31, 31, 32, 33, 33, 33, 33, 33

Offset

1,2

Comments

a(n) = Max{A139325(n,k): 1<=k<=n}.

Links

Table of n, a(n) for n=1..74.

Example

a(4)=Max{#{3,5,7},#{11,13},#{17,19,23},#{29,31}}=Max{3,2,3,2}=3:
..1 ...3 ...5 ...7 ... primes in first row = {3,5,7},
..9 ..11 ..13 ..15 ... primes in 2nd row = {11,13},
.17 ..19 ..21 ..23 ... primes in 3rd row = {17,19},
.25 ..27 ..29 ..31 ... primes in 4th row = {29,31}.

Crossrefs

Cf. A139326.

Sequence in context: A353283 A163464 A317137 * A076905 A244224 A259549

Adjacent sequences: A139324 A139325 A139326 * A139328 A139329 A139330

Keyword

nonn

Author

Reinhard Zumkeller, Apr 14 2008

Status

approved