40817

Appears in sequences

• Structured rhombic triacontahedral numbers (vertex structure 7).at n=16A100165
• Nonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+343)^2 = y^2.at n=21A118611
• Negative value of coefficient of x^(n-4) in the characteristic polynomial of a certain n X n integer circulant matrix.at n=3A127409
• Positive numbers y such that y^2 is of the form x^2+(x+16807)^2 with integer x.at n=11A156713
• Number of partitions of n where the difference between consecutive parts is at most 6.at n=43A238866
• Odd numbers k, not powers of primes, such that sigma(k) == 2 modulo 8 and sigma(sigma(k)) == 6 modulo 8.at n=9A332458
• a(n) is the largest term encountered on the path to 0 when iterating the map x -> x', and starting from x = A351255(n). Here x' means the arithmetic derivative of x, A003415.at n=52A351261
• Triangle read by rows: T(n,k) is the number of non-isomorphic multiset partitions of weight n with k parts and no constant parts or vertices that appear in only one part, 0 <= k <= floor(n/2).at n=69A369286
• Positive numbers b such that a + b + c = d are abcd quadruples in the "abcd-conjecture" with a < b < c < d, all |a|, b, c, d are pairwise coprime, the quality q of the quadruple has q > 1, term a = +/- 1 = A376149(n) and term c = A376143(n). Quadruples are sorted by c then b.at n=39A376144