44869

Appears in sequences

• Triangle read by rows: T(n,k) is the number of skew Dyck paths of semilength n and having k LL's (n >= 0; 0 <= k <= n-2 for n >= 2).at n=39A128724
• Products (semiprimes) of two distinct double-safe primes.at n=16A157356
• Coefficients in the expansion of C/B^2, in Watson's notation of page 118.at n=22A160525
• Carryless squares of carryless primes (cf. A169887).at n=19A169904
• Numbers k that are the products of two distinct primes such that 2*k-1, 4*k-3, 8*k-7, 16*k-15, 32*k-31 and 64*k-63 are also products of two distinct primes.at n=22A177215
• Numbers k that are the products of two distinct primes such that 2*k-1, 4*k-3, 8*k-7, 16*k-15, 32*k-31, 64*k-63 and 128*k-127 are also products of two distinct primes.at n=5A177216
• The products k of two distinct primes such that 2*k-1, 4*k-3, 8*k-7, 16*k-15, 32*k-31, 64*k-63, 128*k-127 and 256*k-255 are also products of two distinct primes.at n=2A177217
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 491", based on the 5-celled von Neumann neighborhood.at n=38A272541
• Numbers k such that A383844(k) and A383844(k+1) are nonzero.at n=52A384310