31724

Appears in sequences

• Numbers k such that 111*2^k+1 is prime.at n=15A032405
• Rank of K-groups of Furstenberg transformation group C*-algebras of n-torus.at n=20A084239
• Number of all extensions over Q_2 with degree n in the algebraic closure of Q_2.at n=11A100976
• Expansion of Product_{k > 0} (1 + f(k)*x^k), where f(1) = 1 and f(m) = prime(m-1) for m >= 2.at n=19A152006
• a(n) = practical(2^n) where practical(n) is the n-th practical number (A005153).at n=12A225316
• Numbers n such that n and n+1 both have 24 divisors.at n=8A274362
• Numbers k such that bsigma(k) = bsigma(k+1), where bsigma(k) is the sum of the bi-unitary divisors of k (A188999).at n=25A293183
• Numbers k such that isigma(k) = isigma(k+1), where isigma(k) is the sum of the infinitary divisors of k (A049417).at n=27A306985
• Number of sequences n = b_1 < b_2 < ... < b_t = A329732(n) such that b_1*b_2*...*b_t is a perfect cube.at n=19A329733
• Place n points in general position on each side of a square, and join every pair of the 4*n+4 boundary points by a chord; sequence gives number of edges in the resulting planar graph.at n=6A367122
• Table read by antidiagonals: Place k points in general position on each side of a regular n-gon and join every pair of the n*(k+1) boundary points by a chord; T(n,k) (n >= 3, k >= 0) gives number of edges in the resulting planar graph.at n=29A367190