A072075 Smallest solution to phi(x) = 10^n where phi(x) = A000010(x).
1, 11, 101, 1111, 10291, 100651, 1004251, 10165751, 100064101, 1000078501, 10000222501, 100062501601, 1000062516001, 10000062660001, 100002441447211, 1003922328562757, 10000390625025601, 100000002482366251, 1000000002851006251, 10000062500000160001
Offset: 0
Keywords
Examples
n=3: a(3)=1111 because InvPhi[1000]= {1111,1255,1375,1875,2008,2222,2500,2510,2750,3012,3750}.
Links
- Ray Chandler, Table of n, a(n) for n = 0..1000
- Max A. Alekseyev, Computing the Inverses, their Power Sums, and Extrema for Euler's Totient and Other Multiplicative Functions. Journal of Integer Sequences, Vol. 19 (2016), Article 16.5.2
Extensions
More terms from Max Alekseyev, Apr 26 2010
a(18)-a(19) from Donovan Johnson, Feb 02 2012