22040

Appears in sequences

• a(n) = (9*n+1)*(9*n+8).at n=16A001534
• a(n) = n*(n + 1)*(3*n + 1).at n=19A027903
• Numbers k such that k^2 and k^3 have the same set of digits.at n=28A029797
• Denominators of continued fraction convergents to sqrt(759).at n=11A042463
• Number of nonisomorphic circulant digraphs (i.e., Cayley digraphs for the cyclic group) of order n.at n=17A049297
• 4-Smith numbers.at n=25A103125
• Expansion of (c(q^2)/c(q))^3 in powers of q where c() is a cubic AGM theta function.at n=27A123633
• Expansion of 3 * (b(q^2)^2 / b(q)) / (c(q)^2 / c(q^2)) in powers of q where b(), c() are cubic AGM theta functions.at n=28A128636
• a(n) = Fibonacci(n) mod n^3.at n=29A132636
• This is to A139025 as A139025 to A014688, see A139025 for details.at n=36A139026
• a(n) = 40*(200*n - 49).at n=2A157652
• a(n) = n*(n+1)*(5*n+7)/6.at n=29A162148
• For positive n with prime decomposition n = Product_{j=1..m} (p_j^k_j) define A_n = Sum_{j=1..m} (p_j*k_j) and B_n = Sum_{j=1..m} (p_j^k_j). This sequence gives those n for which A_n and B_n are both prime and B_n = A_n + 2 (i.e., form a twin prime pair).at n=39A185718
• G.f.: 2 - x*2/(1 - (1-8*x)^(1/4)).at n=7A256093
• Expansion of (psi(-x^3) / f(x))^2 in powers of x where psi(), f() are Ramanujan theta functions.at n=18A261369
• Expansion of 3 * a(q^2) * b(q^2) * c(q^2) / (b(q) * c(q)^2) in powers of q where a(), b(), c() are cubic AGM theta functions.at n=28A263538
• Number of subsets of {1,2,...,n} such that no two elements differ by 3 or 4.at n=23A351873