OFFSET
1,1
COMMENTS
p^k is a member if p is prime and 1 <= k < p/log_2(p).
p*q is a member if p and q are primes and p < q < 2^p/p.
LINKS
Robert Israel, Table of n, a(n) for n = 1..10000
EXAMPLE
a(24) = 77 is a member because its least prime factor is 7, and 7 > log_2(77) ~= 6.2668.
MAPLE
filter:= proc(n) 2^min(numtheory:-factorset(n)) > n end proc:
select(filter, [$2..1000]);
MATHEMATICA
filterQ[n_] := FactorInteger[n][[1, 1]] > Log[2, n];
Select[Range[2, 1000], filterQ] (* Jean-François Alcover, Jul 31 2020 *)
PROG
(Magma) [k:k in [2..250]| PrimeDivisors(k)[1] gt Log(2, k)]; // Marius A. Burtea, Jul 03 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
Robert Israel, Jul 03 2019
STATUS
approved