A131493 Values of n such that Pi^n starts with the digits n.

3, 226, 1837, 2163, 5358, 44857, 170788, 482721, 8918391, 36589396, 122394502, 1107852077, 10071260304, 22991513047, 81477190549, 422242473309, 4242315932866, 153777057499935, 282960008506695, 1683262946768556, 1099372130016731506, 1117679864051418714

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