login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A359238 Number of divisors of 5*n-4 of form 5*k+1. 4
1, 2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 2, 2, 4, 2, 2, 2, 2, 2, 4, 2, 2, 2, 2, 3, 4, 2, 2, 2, 2, 2, 4, 2, 2, 2, 4, 2, 4, 2, 2, 2, 2, 2, 4, 2, 2, 4, 2, 2, 4, 2, 3, 2, 2, 2, 4, 2, 4, 2, 2, 2, 4, 2, 2, 2, 2, 2, 6, 4, 2, 2, 2, 2, 4, 2, 2, 2, 2, 2, 6, 2, 2, 2, 4, 2, 4, 2, 2, 3, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Seiichi Manyama, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = A001876(5*n-4).

G.f.: Sum_{k>0} x^k/(1 - x^(5*k-4)).

PROG

(PARI) a(n) = sumdiv(5*n-4, d, d%5==1);

(PARI) my(N=100, x='x+O('x^N)); Vec(sum(k=1, N, x^k/(1-x^(5*k-4))))

CROSSREFS

Cf. A001876, A359233, A359236, A359237.

Sequence in context: A096917 A336664 A335108 * A320011 A068049 A297850

Adjacent sequences: A359235 A359236 A359237 * A359239 A359240 A359241

KEYWORD

nonn,easy

AUTHOR

Seiichi Manyama, Dec 22 2022

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 22 22:02 EDT 2023. Contains 361434 sequences. (Running on oeis4.)