OFFSET
1,2
LINKS
Nathaniel Johnston, Table of n, a(n) for n = 1..10000
EXAMPLE
Triangle begins:
1
2
3
3 4 5
3 . 5 . 7
. . 5 6 7 . .
3 . . . 7 . . . 11
3 . 5 . . 8 . . 11 . 13
. . 5 . 7 . 9 . 11 . 13 . .
3 . . . 7 . . 10 . . 13 . . . 17
MAPLE
for n from 1 to 10 do for k from 1 to 2*n-1 do if(k=n or (isprime(k) and isprime(2*n-k)))then print(k):fi:od:od: # Nathaniel Johnston, Apr 18 2011
CROSSREFS
KEYWORD
easy,nonn,tabf
AUTHOR
Omar E. Pol, Jan 14 2009
EXTENSIONS
a(31)-a(70) from Nathaniel Johnston, Apr 18 2011
STATUS
approved