OFFSET
1,7
COMMENTS
Conjecture: There are only six 0's in this sequence.
EXAMPLE
Array begins:
n ............... Pair
1 .............. 0 . 0
2 .............. 0 . 0
3 .............. 0 . 0
4 .............. 3 . 5
5 ............ 3 . . . 7
6 .............. 5 . 7
7 ........ 3 . . . . . . . 11
8 .......... 5 . . . . . 11
9 ............ 7 . . . 11
10 ......... 7 . . . . . 13
MAPLE
A154800 := proc(n) local d; for d from 1 to n-1 do if isprime(n-d) and isprime(n+d) then printf("%d, %d, ", n-d, n+d); RETURN() ; fi; od: printf("0, 0, ") ; end: seq(A154800(n), n=1..80) ; # R. J. Mathar, Jul 13 2009
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Omar E. Pol, Jan 15 2009, Jan 18 2009
EXTENSIONS
More terms from R. J. Mathar, Jul 13 2009
STATUS
approved