OFFSET
1,2
COMMENTS
The old entry with this sequence number was a duplicate of A005171.
The asymptotic density of this sequence is Sum_{c composite} (1/zeta(c) - 1/zeta(c-1)) = 0.1182437806... - Amiram Eldar, Oct 18 2020
LINKS
Charles R Greathouse IV, Table of n, a(n) for n = 1..10000
FORMULA
From Reinhard Zumkeller, Nov 30 2015: (Start)
a(A055229(n)) > 1 for n > 1. (End)
MATHEMATICA
Join[{1}, Select[Range[500], !PrimeQ[1+Max[FactorInteger[#][[All, 2]]]]&]] (* Jean-François Alcover, Aug 02 2018 *)
PROG
(PARI) isA060476(n) = if(n<2, 1, !isprime(vecmax(factor(n)[, 2])+1))
(Haskell)
a060476 n = a060476_list !! (n-1)
a060476_list = filter ((== 0) . a010051' . (+ 1) . a051903) [1..]
-- Reinhard Zumkeller, Nov 30 2015
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Sep 18 2008
STATUS
approved