OFFSET
1,1
COMMENTS
Conjecture: No entry is zero.
EXAMPLE
a(1) = 1*2 + 1 = 3 and not 2.
a(4) = 604801 = 4*5*6*7*8*9*10 + 1 and 4*5 + 1, 4*5*6 + 1, etc. up to 4*5*...*9 + 1 are composite.
MAPLE
for i from 2 while i < 40 do c := i; for j from i+1 while j < 10000000 do c := c*j; if (isprime(c+1)) then print(i, j, c+1); break; end if; end do; end do; # Jim Nastos
MATHEMATICA
sp[n_]:=Module[{k=1}, While[!PrimeQ[Times@@Range[n, n+k]+1], k++]; Times@@ Range[ n, n+k]+1]; Array[sp, 40] (* Harvey P. Dale, Jun 17 2014 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Amarnath Murthy, Nov 01 2003
EXTENSIONS
More terms from Jim Nastos, Nov 02 2003
More terms from David Wasserman, Sep 09 2005
STATUS
approved