53792

Appears in sequences

• Expansion of 1/(1-2*x-2*x^3).at n=13A052912
• Numbers k such that the number of divisors of k equals the number of anti-divisors of k.at n=16A073694
• Binomial transform of sinh(x)*cosh(sqrt(2)*x).at n=10A084154
• Let q(p) be the smallest prime greater than the prime p. A positive integer n is included in this sequence if n+1 is divisible by q(p) for each prime p dividing n.at n=27A163619
• G.f.: A(x) satisfies A(x) = x/(1 - (1-2x)*A( x/(1-2x) )).at n=8A179488
• Product of the 5th power of a prime and different distinct prime of the 2nd power (p^5*q^2).at n=18A179646
• Irregular triangle read by rows: coefficients in order of decreasing exponents of polynomials P_g(x) related to Hultman numbers.at n=12A185259
• Numbers k such that sigma(k) + tau(k) + phi(k) is a prime, where sigma(k) = A000203(k), tau(k) = A000005(k) and phi(k) = A000010(k).at n=16A229265
• Primitive numbers whose abundance is positive and odd.at n=15A259231
• Nontotients (A005277) that are the product of two totients (A002202).at n=24A329872
• a(n) = Sum_{k=0..floor(n/2)} (-1)^k * binomial(n+1,2*k+1) * Catalan(k).at n=19A360048
• Numbers k for which sqrt(k/2) divides k and the symmetric representation of sigma(k) consists of a single part and its width at the diagonal equals 1.at n=37A365265
• Numbers that have exactly one Zumkeller divisor but are not Zumkeller.at n=13A376877
• a(n) is the least m > 0 such that sigma(m) - 2m = A140863(n).at n=45A380866