A089288 Euler's totient of floor(Pi*10^n), Pi=3.14....

2, 30, 156, 2088, 24480, 314158, 1570792, 15697800, 142466688, 2074821104, 20847434400, 157079632678, 2899112679360, 31222486232352, 306850390136136, 2887898768697600, 13458068181774720, 314159264051394168, 951904100434798080, 15678880610226432000

Offset

0,1

Links

Tyler Busby, Table of n, a(n) for n = 0..200

Formula

a(n) = A000010(A011545(n)).

Mathematica

Table[EulerPhi[Floor[Pi*10^n]], {n, 0, 20}] (* Harvey P. Dale, Dec 21 2015 *)

Crossrefs

Cf. A000796, A000010, A011545.

Sequence in context: A267851 A392162 A379845 * A232602 A396285 A154413

Adjacent sequences: A089285 A089286 A089287 * A089289 A089290 A089291

Keyword

nonn

Author

Reinhard Zumkeller, Oct 30 2003

Extensions

a(18)-a(19) from Tyler Busby, Mar 14 2025

Status

approved