128520

Appears in sequences

• Number of square permutations of n elements.at n=9A003483
• Numbers k such that sigma(k) >= 4*k.at n=19A023198
• Number of n-digit base 4 biquanimous numbers (with leading 0's allowed, but not all-0 string).at n=8A064671
• Numbers n such that phi(sigma(n)) = 5*phi(n).at n=19A067708
• Numbers k such that sigma(k) > 4*k.at n=17A068404
• a(n) = (2*n+1)*(2*n+2)*(2*n+4)*(2*n+5).at n=8A069079
• Number of labeled cyclic subgroups of S_n having order n.at n=9A074880
• Numbers that can be expressed as the difference of the squares of primes in exactly ten distinct ways.at n=7A092006
• Numbers k such that the total number of 1's in the binary expansion of all the divisors of k sets a new record.at n=43A093687
• When the n-th term of this sequence is added to or subtracted from the square of the n-th prime of the form 4k + 1 (i.e., A002144(n)), the result in both cases is a square.at n=35A114200
• Numbers n that raised to the powers from 1 to k (with k>=1) are multiple of the sum of their digits (n raised to k+1 must not be a multiple). Case k=13.at n=17A135198
• Triangle T, read by rows, such that row n equals column 0 of matrix power M^n where M is a triangular matrix defined by M(k+m,k) = binomial(k+m,k) for m=0..2 and zeros elsewhere. Width-2-restricted finite functions.at n=43A141765
• a(n) = n*(n+1)*(n+2)*(n+3)*(n+4)/8.at n=14A151974
• Number of arrangements of n indistinguishable balls in n boxes with the maximum number of balls in any box equal to 10.at n=5A180290
• Number of arrangements of n indistinguishable balls in n boxes with the maximum number of balls in any box equal to n-5.at n=9A180295
• Numbers with prime factorization pqrs^3t^3.at n=2A190385
• Numbers n whose divisors can be partitioned into four disjoint sets whose sums are all sigma(n)/4.at n=19A204831
• Number of nX4 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 1 0 and 1 1 1 vertically.at n=11A208497
• Averages y of twin prime pairs that satisfy y = x^2 + x - 2.at n=21A214840
• Triangle T(n,k) represents the coefficients of (x^14*d/dx)^n, where n=1,2,3,...; generalization of Stirling numbers of second kind A008277, Lah-numbers A008297.at n=11A223516