18894

Appears in sequences

• Indices of primes in sequence defined by A(0) = 79, A(n) = 10*A(n-1) - 21 for n > 0.at n=26A101150
• Difference between the product of two consecutive primes and the next prime.at n=32A111071
• Sum of staircase twin primes according to the rule: top * bottom - next top.at n=10A135285
• Expansion of b(q^2) * c(q^2) / (3 * b(q)^2) in powers of q where b(), c() are cubic AGM functions.at n=9A233698
• Number of partitions of n where the difference between consecutive parts is at most 3.at n=43A238863
• The number of overpartitions of n with restricted odd differences.at n=31A260890
• Expansion of psi(x) * f(-x^18)^3 / (phi(-x^3) * f(-x^3)^3) in powers of x where phi(), psi(), f() are Ramanujan theta functions.at n=27A261992
• Number of nonempty subsets of {1..n} whose product is divisible by their sum.at n=16A326156
• Dirichlet g.f.: zeta(s)^2 * zeta(s-2)^2.at n=35A328490
• a(n) is the surface area of the symmetric tower described in A221529 which is a polycube whose successive terraces are the symmetric representation of sigma A000203(i) (from i = 1 to n) starting from the top and the levels of these terraces are the partition numbers A000041(h-1) (from h = 1 to n) starting from the base.at n=22A345023