153153

Appears in sequences

• Expansion of 1/((1-6x)(1-7x)(1-8x)(1-11x)).at n=4A028202
• Lucky numbers that are concatenations of a number k with itself.at n=20A032650
• Denominator of (1/n)*Sum_{k=0..n-1} 1/binomial(n-1,k) for n>0 else 1.at n=17A046879
• Denominator of (1/n)*Sum_{k=0..n-1} 1/binomial(n-1,k) for n>0 else 1.at n=18A046879
• Odd abundant numbers not divisible by 5.at n=1A064001
• Primitive abundant numbers that set a new record for number of divisors.at n=10A083873
• Smallest number having n divisors ending with 1 or 9.at n=23A085645
• Denominator of Sum_{k=0..n} binomial(n,k)/(n^2+k^2+1).at n=4A086721
• Numerators of triangle T(n,k), n>=0, 0<=k<=n, read by rows: T(n,k) is the coefficient of x^(2k+1) in polynomial t_n(x), used to define continuous and n times differentiable sigmoidal transfer functions.at n=38A144815
• Denominator of the polynomial A_l(x) = Sum_{d=1..l-1} x^(l-d)/d for index l=2n+1 evaluated at x=8.at n=8A145624
• a(n) = n*(n+1)*(7*n^2 - n - 4)/4.at n=17A172077
• Numbers k such that the sum of the distinct prime divisors of k equals three times the largest prime divisor of k.at n=11A200090
• Denominator of Sum_{k=1..2n+1} 2^k/k.at n=8A229726
• Denominators of the Harary index for the n-halved cube graph.at n=35A290348
• Denominators of the Harary index for the n-halved cube graph.at n=36A290348
• Least odd primitive abundant number having its prime signature.at n=17A316116
• Smallest number having exactly n divisors ending with 3 or 7.at n=23A331082
• a(n) = Product_{k = ceiling(n/2)..n-1} A090252(k).at n=10A354758
• Primitive abundant numbers for which there is no smaller primitive abundant number having the same ordered prime signature.at n=30A357921
• a(n) = denominator(R(2*n + 1, 2*n + 1, 1)) where R(n, k, x) = Sum_{u=0..k} ( Sum_{j=0..u} x^j * binomial(u, j) * (j + 1)^n ) / (u + 1).at n=8A362999