40006

Appears in sequences

• Take list of cubes, move left digit of each term to end of previous term.at n=41A032761
• Equal divisions of the octave of decreasing eleven-limit Pepper ambiguity.at n=14A117557
• Expansion of 1/(1 - x - x^8 - x^15 + x^16).at n=54A173925
• Let an integer with k+1 digits as n = d(k)*10^k + d(k-1)*10^(k-1) + ... + d(0)*10^0 and consider the transform T(n) = k*10^d(k) + (k-1)*10^d(k-1) + ... + 0*10^d(0). a(n) gives the fixed points of the transform T(n).at n=29A226767
• Number of acute triangles, distinct up to congruence, on a centered hexagonal grid of size n.at n=18A241232
• Least integer m > 0 with pi(m*n) = sigma(m), where sigma(m) is the sum of all positive divisors of m.at n=17A247603
• G.f. A(x) satisfies: A(x) = 1 + x * A(x)^6 / (1 + x).at n=6A349362
• Centered pentagonal numbers which are products of three distinct primes.at n=20A364610
• a(n) = Sum_{k=0..n} (-1)^(n-k) * binomial(n-1,k-1) * binomial(n*k,k) / ((n-1)*k+1).at n=6A378410