18997

Appears in sequences

• Numbers n of the form k + reverse(k) for exactly two k.at n=36A072040
• Odd numbers k such that (10^k - 1)/3 - 2*10^floor(k/2) is a palindromic wing prime (a.k.a. near-repdigit palindromic prime) of the form 3...313...3.at n=17A077775
• Numbers n such that Maple 9.5, Maple 10, Maple 11 and Maple 12 give the wrong answers for the number of partitions of n.at n=16A110375
• a(n) = AlexanderPolynomial[n] defined as Det[Transpose[S]-n S] where S is Kronecker Product of two 2 X 2 Seifert matrices {{-1, 1}, {0, -1}} [X] {{-1, 1}, {0, -1}} = {{1, -1, -1, 1}, {0, 1, 0, -1}, {0, 0, 1, -1}, {0, 0, 0, 1}}.at n=12A138849
• Composite numbers n such that 8*n^2-2*n-1 divides the primitive part U(n) of Fibonacci(n).at n=40A159234
• E.g.f.: artanh(x*exp(x)).at n=6A216401
• Composite numbers coprime to 6 such that A179382(n) = A000265(n-1), the odd part of n-1.at n=30A225913
• Number of aperiodic necklaces (Lyndon words) with k<=5 black beads and n-k white beads.at n=40A277629
• Number of n-dimensional representations of the group SU(3).at n=50A346159
• a(n) = smallest k such that li(k) - pi(k) >= n, where li(k) is the logarithmic integral and pi(x) is the number of primes <= x.at n=28A359145