OFFSET
1,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
MAPLE
isA191905 := proc(n) if not isA125493(n) then false; else isprime( A191906(n)) ; end if; end proc:
for n from 3 to 710 do if isA191905(n) then printf("%d, ", n) ; end if; end do: # R. J. Mathar, Jun 27 2011
MATHEMATICA
fQ[n_]:=Module[{pd=Most[Divisors[n]]}, !PerfectNumberQ[n]&&CompositeQ[n] && DivisorSigma[ 1, n]<2n&& PrimeQ[Mod[Times@@pd, Total[pd]]]] Select[Range[2, 600], fQ] (* Harvey P. Dale, Jul 14 2024 *)
CROSSREFS
KEYWORD
nonn,less
AUTHOR
Juri-Stepan Gerasimov, Jun 19 2011
EXTENSIONS
Corrected by R. J. Mathar, Jun 27 2011
STATUS
approved