OFFSET
1,1
COMMENTS
Positive integers not included in A072510. Sequence includes all squares of primes.
LINKS
Robert Israel, Table of n, a(n) for n = 1..10000
EXAMPLE
Divisors of 384 are 1,2,3,4,6,8,12,16,24,32,48,64,96,128,192,384. Partial products are: 1=1, 1*2=2, 1*2*3=6, 1*2*3*4=24, 1*2*3*4*6=144, 1*2*3*4*6*8=1152 and so 384 (144<384<1152) is not in A072510.
MAPLE
filter:= proc(n) local F, d, p;
F:= sort(convert(numtheory:-divisors(n), list));
p:= 1:
for d in F do
p:= p*d;
if p > n then return true
elif p = n then return false
fi
od;
end proc:
select(filter, [$1..1000]); # Robert Israel, Sep 28 2016
MATHEMATICA
Select[Range[200], !MemberQ[FoldList[Times, 1, Divisors[#]], #]&] (* Harvey P. Dale, Jun 18 2013 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Vladimir Baltic, Aug 03 2002
EXTENSIONS
Edited by Robert Israel, Sep 28 2016
STATUS
approved