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!)
A348360 a(n) = Product_{d|n} d^(d'), where ' is the arithmetic derivative. 0
1, 2, 3, 512, 5, 46656, 7, 35184372088832, 1594323, 100000000, 11, 2208245755649745670373376, 13, 289254654976, 38443359375, 11972621413014756705924586149611790497021399392059392, 17, 5689644950987917544474214347285987328, 19 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..19.

FORMULA

a(p) = p for primes p since we have a(p) = 1^1' * p^p' = 1^0 * p^1 = p.

EXAMPLE

a(4) = 512; a(4) = Product_{d|4} d^d' = 1^1' * 2^2' * 4^4' = 1^0 * 2^1 * 4^4 = 1 * 2 * 256 = 512.

MATHEMATICA

Array[Times @@ Map[#^If[# < 2, 0, # Total[#2/#1 & @@@ FactorInteger[#]]] &, Divisors[#]] &, 19] (* Michael De Vlieger, Oct 14 2021 *)

CROSSREFS

Cf. A003415.

Sequence in context: A196070 A173342 A090510 * A004887 A240709 A264577

Adjacent sequences:  A348357 A348358 A348359 * A348361 A348362 A348363

KEYWORD

nonn

AUTHOR

Wesley Ivan Hurt, Oct 14 2021

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 May 18 08:30 EDT 2022. Contains 353785 sequences. (Running on oeis4.)