8126464

Appears in sequences

• Generalized class numbers c_(n,2).at n=27A000362
• a(n+1)=2a(n)-4a(n-1)+4a(n-2).at n=28A035302
• Smallest number beginning with 8 and having exactly n prime divisors counted with multiplicity.at n=18A106428
• Let S(n)=Sigma(n)/2. Numbers n such that S(S(n))=n, 1/2-Sociable number of order 1 or 2.at n=36A113791
• a(n) = 2*a(n-1) + 2^(n-1), for n > 0, with a(0)=6.at n=19A159694
• a(n) = (2^n-1)*4^(2*n-1).at n=5A163839
• Numbers with 38 divisors.at n=9A175747
• Conjectured list of smallest members of fully k-sociable cycles of order r.at n=35A183026
• a(1) = 1, a(2) = 2, a(3) = 5, a(4) = 8 and a(5) = 15, a(n) = Sum_{j=1..n-1} a(j).at n=23A257548
• Non-unitary amicable numbers.at n=35A259037
• Smaller of a non-unitary amicable pair.at n=18A259038
• Decimal representation of the n-th iteration of the "Rule 91" elementary cellular automaton starting with a single ON (black) cell.at n=20A267042
• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 291", based on the 5-celled von Neumann neighborhood.at n=26A280568
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 478", based on the 5-celled von Neumann neighborhood.at n=27A288506
• a(0) = 1, a(1) = 4, a(2) = 11, and a(n) = 4*a(n-1) - 4*a(n-2) for n >= 3.at n=19A339252
• Optimal link functions for repeat avoidance in double elimination tournaments.at n=22A356189
• Lesser member of Carmichael's variant of amicable pair: numbers k < m such that s(k) = m and s(m) = k, where s(k) = A371418(k).at n=16A371419