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

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A131493 Values of n such that Pi^n starts with the digits n. 0
3, 226, 1837, 2163, 5358, 44857, 170788, 482721, 8918391, 36589396, 122394502, 1107852077, 10071260304, 22991513047, 81477190549, 422242473309, 4242315932866, 153777057499935, 282960008506695, 1683262946768556, 1099372130016731506, 1117679864051418714 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

226 is a term of this sequence because Pi^226 = 226.9191... * 10^110, which starts with 226.

PROG

(PARI) s=1; for(i=1, 10000000, s=s*Pi; if(s-i>11, s=s/10, ); if(floor(s)==i, printp1(i, ", "), ))

CROSSREFS

Cf. A100129, A131494

Sequence in context: A157582 A241098 A254157 * A228871 A195500 A099426

Adjacent sequences:  A131490 A131491 A131492 * A131494 A131495 A131496

KEYWORD

nonn,base

AUTHOR

Randy L. Ekl, Aug 12 2007

EXTENSIONS

a(10)-a(12) from Jon E. Schoenfield, Jul 17 2010

a(13)-a(22) from Max Alekseyev, Sep 12 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 December 13 03:41 EST 2019. Contains 329968 sequences. (Running on oeis4.)