login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A190468 Numbers with prime factorization pq^4r^5. 3
12960, 18144, 19440, 27216, 28512, 33696, 42768, 44064, 49248, 50544, 59616, 60000, 66096, 73872, 75168, 80352, 89424, 95904, 106272, 111456, 112752, 120528, 121824, 137376, 140000, 143856, 150000, 152928, 158112, 159408, 167184, 173664 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

T. D. Noe, Table of n, a(n) for n = 1..1000

Will Nicholes, Prime Signatures

MATHEMATICA

f[n_]:=Sort[Last/@FactorInteger[n]]=={1, 4, 5}; Select[Range[300000], f]

PROG

(PARI) list(lim)=my(v=List(), t1, t2); forprime(p=2, (lim\48)^(1/5), t1=p^5; forprime(q=2, (lim\t1)^(1/4), if(p==q, next); t2=t1*q^4; forprime(r=2, lim\t2, if(p==r||q==r, next); listput(v, t2*r)))); vecsort(Vec(v)) \\ Charles R Greathouse IV, Jul 20 2011

CROSSREFS

Cf. A190466, A190467.

Sequence in context: A090887 A246890 A145333 * A028385 A335742 A238142

Adjacent sequences:  A190465 A190466 A190467 * A190469 A190470 A190471

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, May 10 2011

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 18 18:57 EDT 2021. Contains 344000 sequences. (Running on oeis4.)