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

 

Logo

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A101423 Number of different cuboids with volume p^3 * q^n, where p,q are distinct prime numbers. 4
3, 6, 12, 19, 28, 38, 51, 64, 80, 97, 116, 136, 159, 182, 208, 235, 264, 294, 327, 360, 396, 433, 472, 512, 555, 598, 644, 691, 740, 790, 843, 896, 952, 1009, 1068, 1128, 1191, 1254, 1320, 1387, 1456, 1526, 1599, 1672, 1748, 1825, 1904, 1984, 2067, 2150, 2236 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

Subsequence of A034836, which gives the number of cuboids for volume n.

LINKS

Table of n, a(n) for n=0..50.

FORMULA

a(n) = A034836(2^3*3^n) = A034836(3^3*2^n) = A034836(p^3*q^n) for p,q distinct primes.

Empirical g.f.: -(x^3+3*x^2+3*x+3)/((x+1)*(x^2+x+1)*(x-1)^3). - Colin Barker, Mar 28 2014

CROSSREFS

Cf. A034836, A101424, A101425, A101426, A101427.

Sequence in context: A074899 A318872 A267591 * A263511 A180622 A125851

Adjacent sequences:  A101420 A101421 A101422 * A101424 A101425 A101426

KEYWORD

nonn

AUTHOR

Anthony C Robin, Jan 17 2005

EXTENSIONS

Corrected, edited and extended by Ray Chandler, Dec 19 2008

a(0)=3 prepended and g.f. edited by Alois P. Heinz, Oct 05 2016

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 January 19 18:25 EST 2020. Contains 331051 sequences. (Running on oeis4.)