OFFSET
1,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..200
EXAMPLE
a(3) = 241 == 1 (mod 120), 120 = 4*5*6.
MATHEMATICA
sp[x_]:=Module[{k=1}, While[CompositeQ[k*x+1], k++]; k x+1]; Module[ {nn= 15, nx}, nx = Times@@@TakeList[Range[(nn(nn+1))/2], Range[nn]]; sp/@nx] (* Harvey P. Dale, May 01 2022 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Amarnath Murthy, Sep 24 2003
EXTENSIONS
More terms from David Wasserman, Jul 19 2005
STATUS
approved