OFFSET
1,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
MATHEMATICA
Select[Prime[Range[200]], PrimeQ[#+DivisorSigma[0, #+1]]&] (* Harvey P. Dale, Nov 30 2014 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Leroy Quet, May 07 2010
EXTENSIONS
Extended by D. S. McNeil and Jon E. Schoenfield, May 10 2010
STATUS
approved