OFFSET
1,1
LINKS
Martin Møller Skarbiniks Pedersen and Giovanni Resta, Table of n, a(n) for n = 1..700 (first 99 terms from M. M. S. Pedersen)
MATHEMATICA
Select[Prime@ Range[10^5], Equal @@ DivisorSigma[1, # + {-3, 3}] &] (* Giovanni Resta, May 15 2016 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Vladimir Joseph Stephan Orlovsky, Dec 03 2009
STATUS
approved