A083248 Numbers satisfying the following inequalities: A045763[n]>A000010[n]>A000005[n].

36, 40, 42, 48, 50, 54, 56, 60, 66, 70, 72, 78, 80, 84, 88, 90, 96, 98, 100, 102, 104, 105, 108, 110, 112, 114, 120, 126, 130, 132, 136, 138, 140, 144, 150, 152, 154, 156, 160, 162, 168, 170, 174, 176, 180, 182, 184, 186, 190, 192, 196, 198, 200, 204, 208, 210

Offset

1,1

Links

Table of n, a(n) for n=1..56.

Example

n=100: d[n]=9,phi[n]=40,unrelateds[n]=100-9-40+1=52 so
52>40>9 holds; primes are not here since A045763[p]=0 < A000005[p]=2.

Mathematica

Do[r=EulerPhi[n]; d=DivisorSigma[0, n]; u=n-r-d+1; If[Greater[u, r]&&Greater[r, d], Print[n, {d, r, u}]], {n, 1, 1000}]

Crossrefs

Cf. A000005, A000010, A045763, A073757, A083243-A083247, A020488.

Sequence in context: A248372 A349705 A129288 * A360765 A077090 A254836

Adjacent sequences: A083245 A083246 A083247 * A083249 A083250 A083251

Keyword

nonn

Author

Labos Elemer, May 07 2003

Status

approved