OFFSET
1,1
EXAMPLE
2*3 - (3-2) = 2*3 - 1 = 5;
3*5 - (5-3) = 3*5 - 2 = 13;
7*11 - (11-4) = 7*11 - 4 = 73.
MATHEMATICA
a = {}; Do[p1 = Prime[n]; p2 = Prime[n + 1]; p = p1*p2 - (p2 - p1); If[PrimeQ[p], AppendTo[a, p]], {n, 10^2}]; a
Select[#[[1]]#[[2]]-(#[[2]]-#[[1]])&/@Partition[Prime[Range[250]], 2, 1], PrimeQ] (* Harvey P. Dale, Feb 01 2011 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Vladimir Joseph Stephan Orlovsky, Jun 21 2008
EXTENSIONS
More terms from Harvey P. Dale, Feb 01 2011
STATUS
approved