OFFSET
1,12
COMMENTS
Each entry of the n-th row is either 0 or a prime p from the 2n-th row of A002260 such that 2n-p is also prime. - Jason Kimberley, Jul 08 2012
LINKS
Nathaniel Johnston, Table of n, a(n) for n = 1..10000
EXAMPLE
Triangle begins:
0
0, 0, 0
0, 0, 0, 0, 0
0, 0, 3, 0, 5, 0, 0
0, 0, 3, 0, 0, 0, 7, 0, 0
0, 0, 0, 0, 5, 0, 7, 0, 0, 0, 0
0, 0, 3, 0, 0, 0, 0, 0, 0, 0,11, 0, 0
0, 0, 3, 0, 5, 0, 0, 0, 0, 0,11, 0,13, 0, 0
0, 0, 0, 0, 5, 0, 7, 0, 0, 0,11, 0,13, 0, 0, 0, 0
0, 0, 3, 0, 0, 0, 7, 0, 0, 0, 0, 0,13, 0, 0, 0,17, 0, 0
From Jason Kimberley, Jul 08 2012: (Start)
Square array begins:
3, 3, 3, 0, 3, 3, 0, 3, 3, ...
0, 0, 0, 0, 0, 0, 0, 0, ...
5, 5, 5, 0, 5, 5, 0, 5, ...
0, 0, 0, 0, 0, 0, 0, ...
7, 7, 7, 0, 7, 7, 0, ...
0, 0, 0, 0, 0, 0, ...
0, 0, 0, 0, 0, 0, ...
0, 0, 0, 0, 0, ...
11, 11, 11, 0, 11, ...
0, 0, 0, 0, ...
13, 13, 13, 0, ...
0, 0, 0, ...
0, 0, 0, ...
0, 0, ...
17, 17, ...
0, ...
19, ...
MAPLE
for n from 1 to 10 do for k from 1 to 2*n-1 do if(not k=n and (isprime(k) and isprime(2*n-k)))then print(k):else print(0):fi:od:od: # Nathaniel Johnston, Apr 18 2011
CROSSREFS
KEYWORD
easy,nonn,tabf
AUTHOR
Omar E. Pol, Jan 14 2009
STATUS
approved