21516

Appears in sequences

• Magnetic Tower of Hanoi, total number of moves, optimally solving the [RED ; NEUTRAL ; BLUE] pre-colored puzzle.at n=10A183114
• Even dodecagonal numbers: a(n) = 4*n*(5*n - 2).at n=33A193872
• Record (maximal) gaps between prime triples (p, p+4, p+6).at n=36A201596
• Number of 3 X n 0..1 arrays with diagonals and antidiagonals unimodal and rows nondecreasing.at n=30A223950
• Trisection of A107926: The least number k such that there are primes p and q with p - q = 6*n+4, p + q = k, and p the least such prime >= k/2.at n=31A234956
• Number of partitions of n, where the difference between the number of odd parts and the number of even parts is 9.at n=48A240018
• Numbers k such that k - 13, k + 1, k + 5, k + 7, and k + 13 are all prime.at n=8A281937
• Number of permutations of [n] where each pair of adjacent elements differs by a prime.at n=11A367704