18212

Appears in sequences

• Numerators of continued fraction convergents to sqrt(263).at n=9A041492
• Numbers having four 4's in base 8.at n=7A043440
• Numbers n such that n | 8^n + 7^n + 6^n + 5^n + 4^n + 3^n + 2^n + 1^n.at n=42A056751
• Number of permutations of 1..n containing the relative rank sequence { 235614 } at any spacing.at n=3A159147
• Number of permutations of 1..n containing the relative rank sequence { 256413 } at any spacing.at n=3A159168
• Smallest even number k such that lpf(k-3) = prime(n) while lpf(k-1) > lpf(k-3), where lpf=least prime factor (A020639).at n=30A242490
• Smallest even k such that the pair {k-3,k-1} is not a twin prime pair and lpf(k-1) > lpf(k-3) >= prime(n), where lpf = least prime factor (A020639).at n=30A242720
• Least even k such that sfdf(k-1) > sfdf(k-3) >= A050376(n), where sfdf(n) is the smallest Fermi-Dirac factor of n (A223490), and k-3 is not the lesser of a pair of Fermi-Dirac twin primes (A229064).at n=37A244412
• Let s(n,j) be Sum_{i=1..j} (prime(primepi(n) + i) mod n). Numbers n such that there exists j with s(n,j) = n.at n=39A274423
• a(n) is the smallest positive integer m such that 2^n appears as the denominator of a convergent to sqrt(m).at n=14A338308
• Number of free linear polycubes of size n, identifying rotations and reflections and avoiding the eight corner-connected neighbors.at n=12A363204