A076829 a(n) = floor(log(log(n^n^n))).
1, 3, 5, 8, 11, 14, 17, 20, 23, 27, 30, 34, 37, 41, 45, 49, 53, 57, 61, 65, 69, 73, 77, 81, 85, 90, 94, 98, 103, 107, 112, 116, 121, 125, 130, 134, 139, 144, 148, 153, 158, 163, 167, 172, 177, 182, 187, 192, 196, 201, 206, 211, 216, 221, 226, 231, 236, 241, 247
Offset: 2
Keywords
Examples
3^3^3 = 3^27 = 7625597484987. Log(log(7625597484987)) = 3.38..., so a(3)= 3.
Programs
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Mathematica
Table[ Floor[ n * Log[n] + Log[ Log[n]]], {n, 2, 60}]
Formula
a(n) = floor(n*log(n) + log(log(n))).
Extensions
Edited by Robert G. Wilson v, Nov 22 2002
Undefined a(1) removed by Sean A. Irvine, Apr 17 2025