login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A073637 Digital root (cf. A010888) of prime(n)^3. 0
8, 9, 8, 1, 8, 1, 8, 1, 8, 8, 1, 1, 8, 1, 8, 8, 8, 1, 1, 8, 1, 1, 8, 8, 1, 8, 1, 8, 1, 8, 1, 8, 8, 1, 8, 1, 1, 1, 8, 8, 8, 1, 8, 1, 8, 1, 1, 1, 8, 1, 8, 8, 1, 8, 8, 8, 8, 1, 1, 8, 1, 8, 1, 8, 1, 8, 1, 1, 8, 1, 8, 8, 1, 1, 1, 8, 8, 1, 8, 1, 8, 1, 8, 1, 1, 8, 8, 1, 8, 1, 8, 8, 1, 8, 1, 8, 8, 8, 1, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Apart from a(2)=9 all other terms are either 1 or 8.

LINKS

Table of n, a(n) for n=1..100.

EXAMPLE

a(3)=8 because p(3)=5 and 5^3=125 -> sum-of-digits = 8. a(4)=1 because p(3)=7 and 7^3=343 -> sum-of-digits = 10 -> sum-of-digits = 1.

MATHEMATICA

n=3; su[x_] := Sum[IntegerDigits[x][[i]], {i, Length[IntegerDigits[x]]}]; Table[su[su[su[su[Prime[x]^n]]]], {x, 100}]

Table[If[(m9=Mod[Prime[n]^3, 9])==0, 9, m9], {n, 200}]

CROSSREFS

Cf. A010888, A021596, A056992, A010888, A038194, A166923.

Sequence in context: A195341 A205185 A011463 * A153202 A019738 A236098

Adjacent sequences:  A073634 A073635 A073636 * A073638 A073639 A073640

KEYWORD

nonn,base

AUTHOR

Zak Seidov, Sep 01 2002, Oct 23 2009

EXTENSIONS

Edited by N. J. A. Sloane, Oct 29 2009

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 March 25 21:57 EDT 2019. Contains 321477 sequences. (Running on oeis4.)