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 A147551 Minimum of A000010(m) where m is an n-digit number. 2
 1, 4, 32, 240, 2304, 20736, 184320, 1843200, 17740800, 170311680, 1642291200, 16057958400, 153280512000, 1532805120000, 15229951672320, 147149291520000, 1456777986048000, 14214621560832000, 140724753452236800 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS H. v. Eitzen, Table of n, a(n) for n = 1..31 FORMULA a(n) = A000010(A147550(n)) MATHEMATICA a[n_]:=Min[EulerPhi[Range[10^(n-1), 10^n-1]]]; Do[Print[a[n]], {n, 10}] PROG (PARI) a(n)=if(n<3, return(3*n-2)); my(t=eulerphi(10^(n-1))); forstep(k=(10^n\300+1)*30, 10^n, 30, if(eulerphi(k)

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Last modified February 21 15:59 EST 2024. Contains 370237 sequences. (Running on oeis4.)