522752

Appears in sequences

• Numbers k such that phi(k + 6) | sigma(k) + 6.at n=10A015872
• Numbers k such that sigma(k) == 2 (mod k).at n=7A045768
• Coefficient triangle of polynomials (rising powers) related to Pell number convolutions. Companion triangle is A058402.at n=11A058403
• Coefficient triangle of polynomials (falling powers) related to Pell number convolutions. Companion triangle is A058404.at n=13A058405
• Numbers n such that sigma(n) = 2n + omega(n), where omega(n) is the number of distinct prime divisors of n.at n=7A063785
• The floor(n/2)-perfect numbers, where f-perfect numbers for an arithmetical function f are defined in A066218.at n=12A066240
• The sum of the non-divisors of n (less than n) is a multiple of the sum of the divisors of n.at n=35A066860
• Numbers k such that sum of the divisors d of k divides 1 + 2 + ... + k = k(k+1)/2.at n=37A076617
• Numbers k whose abundance-radius does not exceed log(log(k)), i.e., abs(sigma(k)-2*k) <= log(log(k)).at n=22A088818
• Numbers k whose abundance is 2: sigma(k) - 2k = 2.at n=6A088831
• Admirable numbers whose abundance is < 10.at n=28A109788
• Admirable numbers such that the subtracted divisor is square.at n=28A109806
• Abundant numbers n for which the abundance d = sigma(n) - 2*n is a proper divisor, that is, 0 < d < n and d | n.at n=40A181595
• Near-perfect numbers (A181595) of the form 2^(t-1)*(2^t-2^k-1), where 2^t-2^k-1 is prime, k>=1, t>k.at n=22A181701
• Numbers of the form 2^(t-1)*(2^t-3), where 2^t-3 is prime.at n=5A181703
• Number of (w,x,y,z) with all terms in {0,...,n} and even range.at n=31A212889
• Numbers m such that floor(antisigma(m) / m) = antisigma(m) mod m.at n=14A244324
• 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 397", based on the 5-celled von Neumann neighborhood.at n=18A281755
• Admirable numbers such that the subtracted divisor is a Fibonacci number.at n=28A282754
• Numbers k such that bsigma(k) = 2k + 2, where bsigma(k) is the sum of bi-unitary divisors of k (A188999).at n=6A322162