31535

Appears in sequences

• Lucas-Carmichael numbers: squarefree composite numbers k such that p | k => p+1 | k+1.at n=14A006972
• Numbers whose sum of divisors is a sixth power.at n=17A019424
• a(n) = (n-1)*(2*n-1)*(3*n-1).at n=18A033594
• Numbers whose sum of divisors is 6^6 = 46656.at n=14A048256
• Numbers k that divide Lucas(k) + 1.at n=37A094398
• Odd numbers k that divide Lucas(k) + 1.at n=14A094399
• Pell pseudoprimes: odd composite numbers n such that P(n)-Kronecker(2,n) is divisible by n.at n=34A099011
• Smallest order of the cyclotomic polynomial whose maximal coefficient in absolute value is n.at n=29A136418
• Odd squarefree numbers n such that the cyclotomic polynomial Phi(n,x) is not coefficient convex.at n=11A146960
• Lucas-Carmichael numbers with 4 prime factors.at n=3A216926
• Numbers k such that k^3 + 3*k + 3^k is prime.at n=23A220701
• a(n) = least Lucas-Carmichael number which is divisible by b(n), where {b(n)} (A255602) is the list of all numbers which could be a divisor of a Lucas-Carmichael number.at n=41A253598
• Number of orbits of Aut(Z^7) as function of the infinity norm n of the representative lattice point of the orbit, when the cardinality of the orbit is equal to 26880.at n=35A266397
• Lucas-Carmichael numbers whose Dedekind psi value is a square.at n=1A292571
• Lucas-Carmichael numbers whose Dedekind psi value is a cube.at n=1A292572
• Least Lucas-Carmichael number whose Dedekind psi value is an n-th power.at n=5A292573
• Least k > a(n-1) such that k^3 has no digit in common with a(n-1) and a(n+1), a(0)=0.at n=28A294662
• Composite numbers k such that Pell(k) == 1 (mod k).at n=38A319042
• Chebyshev pseudoprimes to both base 2 and base 3: composite numbers k such that T(k, 2) == 2 (mod k) and T(k, 3) == 3 (mod k), where T(k, x) is the k-th Chebyshev polynomial of the first kind.at n=6A330208