73440

Appears in sequences

• Infinitary multi-perfect numbers.at n=6A007358
• Apply partial sum operator 4 times to Fibonacci numbers.at n=17A014166
• a(n) = T(2n, n+2), T given by A027935.at n=8A027938
• Average theta series of odd unimodular lattices of dimension 9 (multiplied by 17).at n=5A029811
• 5-white numbers: partition digits of n^5 into blocks of 5 starting at right; sum of these 5-digit numbers equals n.at n=3A037045
• Products of 4 consecutive integers: a(n) = n*(n-1)*(n-2)*(n-3).at n=18A052762
• a(n) = n*(n-1)*(n-2)*(n-3) for n>=5.at n=18A052768
• Numbers k such that phi(k) = 2*tau(k)^2.at n=32A068564
• Group the natural numbers such that the product of the n-th group is divisible by 2^n. (1), (2), (3,4), (5,6,7,8), (9,10,11,12,13,14),(15,16,17,18), ... Sequence contains the product of the terms of the groups.at n=5A085895
• Determinants of 3 X 3 matrices of discrete blocks of 9 consecutive primes.at n=37A117329
• Denominator of -16/((n+2)*n*(n-2)*(n-4)).at n=33A117465
• Composite numbers such that the square root of the sum of squares of their prime factors is a prime.at n=25A134607
• Row sums of A163334 and A163336.at n=39A163342
• "Kaprekar quintuples": digits of X^5 taken D at a time sum to X (where D is number of digits in X.)at n=5A171500
• Numbers n for which the terms of the multiplicative sequence {n^2/A049417(n)} are integers.at n=36A185288
• Number of 4-step one space for components leftwards or up, two space for components rightwards or down asymmetric quasi-bishop's tours (antidiagonal moves become knight moves) on an n X n board summed over all starting positions.at n=39A187608
• Numbers with prime factorization pqr^3s^5.at n=5A190475
• Triangular array: the fusion of polynomial sequences P and Q given by p(n,x) = (x+2)^n and q(n,x) = (2*x+1)^n.at n=32A193728
• Mirror of the triangle A193728.at n=31A193729
• a(n) = Pell(n)*A008653(n) for n>=1, with a(0)=1, where A008653 is the theta series of direct sum of 2 copies of hexagonal lattice.at n=8A209447