68970

Appears in sequences

• Smallest number m such that when A051953 is applied n times to m the result is neither a power of 2 nor 0.at n=21A053476
• If n mod 2 = 0 then a(n) = n^4/4 - 2*n^2 + 3*n; otherwise, a(n) = n^4/4 - 2*n^2 + 3*n - 5/4.at n=23A064835
• Smallest number m such that the trajectory of m under iteration of cototient function[=A051953] contains exactly n distinct numbers (including m and the fixed point=0). Or: the required number of iterations[=operations,transitions] is n-1.at n=28A098197
• a(n) = n*(n + 1)*(n + 2)*(7*n - 5)/12.at n=18A264850
• Number of excursions of length n with Motzkin-steps avoiding the consecutive steps UU, UD, HH and DU.at n=32A329689
• Number of electrons per subshell in element Z=n expressed as a 56-bit unsigned integer.at n=18A333997
• Nonsquare positive integers k such that k = a*b = c*m + b and b^2 = a*m + c where m > 1, 0 < a, b, c < m.at n=7A347168