login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A046387 Products of 5 distinct primes. 13

%I

%S 2310,2730,3570,3990,4290,4830,5610,6006,6090,6270,6510,6630,7410,

%T 7590,7770,7854,8610,8778,8970,9030,9282,9570,9690,9870,10010,10230,

%U 10374,10626,11130,11310,11730,12090,12210,12390,12558,12810,13090,13110

%N Products of 5 distinct primes.

%C Subsequence of A051270. 4620 = 2^2*3*5*7*11 is in A051270 but not in here, for example. - _R. J. Mathar_, Nov 10 2014

%H T. D. Noe, <a href="/A046387/b046387.txt">Table of n, a(n) for n = 1..10000</a>

%e a(1) = 2310 = 2 * 3 * 5 * 7 * 11 = A002110(5) = 5#.

%e a(2) = 2730 = 2 * 3 * 5 * 7 * 13.

%e a(3) = 3570 = 2 * 3 * 5 * 7 * 17.

%e a(10) = 6006 = 2 * 3 * 7 * 11 * 13.

%t f5Q[n_]:=Last/@FactorInteger[n]=={1, 1, 1, 1, 1}; lst={};Do[If[f5Q[n], AppendTo[lst, n]], {n, 8!}];lst (* _Vladimir Joseph Stephan Orlovsky_, Aug 26 2008 *)

%o (PARI) is(n)=factor(n)[,2]==[1,1,1,1,1]~ \\ _Charles R Greathouse IV_, Sep 17 2015

%Y Cf. A067885 (product of 6 distinct primes).

%Y Cf. A000040, A000961, A001221, A005117, A000977, A002110, A006881, A007304, A007774, A033992, A033993, A046386.

%Y Cf. A014614, A046403, A051270.

%K easy,nonn

%O 1,1

%A _Patrick De Geest_, Jun 15 1998

%E Entry revised by _N. J. A. Sloane_, Apr 10 2006

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified December 7 19:05 EST 2016. Contains 278895 sequences.