49869

Appears in sequences

• Numbers k such that prime(k) + prime(k+1) + prime(k+2) is a square.at n=37A076305
• Antidiagonal sums of table A083050.at n=21A083053
• Numbers k such that k^2 +/- (k-1) and (k-1)*k^2 +/- 1 are all primes.at n=39A239326
• Numbers generated by recursive procedure a(n) = nozero(a(n-1) * 3), in which the function nozero(x) removes all zeros from x, starting with a(1) = 1.at n=14A243845
• Number of Hamiltonian paths in the graph on n vertices {1,...,n}, with i adjacent to j iff |i-j| in {1,3}.at n=23A302119
• 2*a(n)/n! is the average number of key comparisons required to sort n records with distinct keys using heapsort (Algorithm H in Don Knuth's TAOCP Vol. 3).at n=5A350428