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!)
A061569 Number of irreducible representations of the symmetric group S_n such that their degree is divisible by 3. 2
0, 0, 0, 2, 1, 2, 6, 4, 21, 33, 38, 50, 74, 81, 95, 150, 135, 331, 436, 519, 630, 840, 931, 1089, 1472, 1464, 2983, 3691, 4511, 5523, 6761, 8187, 9900, 12067, 14397, 17734, 21394, 25529, 30456, 36609, 43125, 50987, 61074, 70801, 87676, 104100, 121838, 142899 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

The total number of irreducible representations of S_n is the partition function partition(n) (sequence A000041) and the number of irreducible representations of the symmetric group S_n with their degree not divisible by 3 is given in A060840 so a(n) = A000041(n) - A060840(n).

LINKS

Eric M. Schmidt, Table of n, a(n) for n = 1..1000

EXAMPLE

a(3) = 0 because the degrees of the irreducible representations of S_3 are 1,1,2.

PROG

(Sage) def A061569(n) : dig = n.digits(3); return Partitions(n).cardinality() - prod([1, 3^m, 3^m*(3^m+3)//2][dig[m]] for m in range(len(dig))) # Eric M. Schmidt, Apr 30 2013

CROSSREFS

Cf. A000041, A060840.

Sequence in context: A343383 A151962 A072137 * A294523 A286651 A324342

Adjacent sequences:  A061566 A061567 A061568 * A061570 A061571 A061572

KEYWORD

nonn

AUTHOR

Ola Veshta (olaveshta(AT)my-deja.com), May 18 2001

EXTENSIONS

More terms from Eric M. Schmidt, Apr 30 2013

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 16 13:57 EDT 2021. Contains 343947 sequences. (Running on oeis4.)