23247

Appears in sequences

• Expansion of x/(1 - 3*x - 6*x^2).at n=8A083858
• Main diagonal of array A083857.at n=8A083862
• Numbers k such that there is a number m < k satisfying A000203(k) = A000203(m) = m + k - gcd(m,k).at n=33A124141
• Numbers expressible in more than one way as 6^x-y^2.at n=16A134989
• Numbers n such that n^2 can be represented as sum of (at least two) consecutive cubes and n is not a triangular number.at n=29A163393
• Row sums of triangle A175009.at n=27A175006
• Number of strings of numbers x(i=1..7) in 0..n with sum i^2*x(i) equal to n*49.at n=9A183958
• 7 times hexagonal numbers: a(n) = 7*n*(2*n-1).at n=41A195320
• The stonemason's problem: numbers n such that n^2 is the sum of more than three consecutive cubes, the cube 1 being disallowed.at n=30A238099
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 606", based on the 5-celled von Neumann neighborhood.at n=38A273206
• a(n) = Sum_{d|n} lcm(sigma(d), pod(d)) where sigma(k) is the sum of divisors of k (A000203) and pod(k) is the product of divisors of k (A007955).at n=27A334794
• Numbers k such that both k and k+1 are not exponentially squarefree numbers.at n=16A342188