来自在线整数百科全书的问候语!http://oeis.org/ Search: id:a227840 Showing 1-1 of 1 %I A227840 %S A227840 0,0,0,0,1,0,0,0,2,1,0,1,0,0,0,0,0,4,0,0,0,1,1,0,1,0,0,0,0,0,1,0,0,0, %T A227840 1,1,0,1,0,0,0,0,0,1,0,0,0,3,1,0,1,0,0,0,0,0,2,0,0,0,1,1,0,1,0,0,0,0, %U A227840 0,1,0,0,0,1,1,0,1,0,0,0,0,0,1,0,0,0,2,1,0,1,0,0,0,0,0,2,0,0,0,1,1 %N A227840 3^a(n) is the highest power of 3 dividing A000110(n). %C A227840 This is the 3-adic valuation of the Bell numbers A000110. %C A227840 The 2-adic valuation is less interesting: 0, 0, 1, 0, 0, 2, 0, 0, 2, 0, 0, 1, 0, 0, 1, 0, 0, 2, 0, 0, 2, 0, 0, 1, 0, 0, 1, 0, 0, 2, 0, 0, 2, 0, 0, 1, 0, 0, 1, 0, 0, 2, 0, 0, 2, ... %o A227840 (MAGMA) [Valuation(Bell(n), 3): n in [0..110]]; // _Bruno Berselli_, Aug 05 2013 %Y A227840 Cf. A000110, A007949. %K A227840 nonn %O A227840 0,9 %A A227840 _N. J. A. Sloane_, Aug 05 2013 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE