OFFSET
1,2
COMMENTS
Conjecture : If A000005(n) divides A007947(n) for some n, then A007947(n)=A000005(n). [From Ctibor O. Zizka, Feb 05 2009]
LINKS
Donovan Johnson, Table of n, a(n) for n = 1..150
MATHEMATICA
Select[Range[2000000], DivisorSigma[0, #]==Times@@Transpose[ FactorInteger[#]][[1]]&] (* Harvey P. Dale, Apr 09 2012 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Jason Earls, May 07 2002
STATUS
approved