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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A356084 Matula-Goebel number of the complete quaternary (4-ary) tree of n levels. 2

%I #6 Jul 27 2022 10:36:22

%S 1,16,7890481,379723559137648771815613388050801

%N Matula-Goebel number of the complete quaternary (4-ary) tree of n levels.

%F a(n) = prime(a(n-1))^4, for n>=2.

%e For n=3, the complete quaternary tree of 3 levels is

%e 7890481

%e / / \ \ a(4) = prime(16)^4

%e 16 16 16 16 = 7890481

%e // \\ // \\ // \\ // \\

%e 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

%o (PARI) a(n) = my(ret=1); for(i=2,n, ret=prime(ret)^4); ret;

%Y Cf. A007097, A356082 (binary), A356083 (ternary).

%K nonn,more

%O 1,2

%A _Kevin Ryde_, Jul 27 2022

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.

Last modified August 5 05:54 EDT 2024. Contains 374935 sequences. (Running on oeis4.)