27774

Appears in sequences

• Floor[ concatenation of n+3, n+2, n+1 and n divided by 4 ].at n=8A075005
• a(1) = 1, a(2) = 2; for n >= 2, a(n+1) = a(n) + sum of the unique prime factors of a(n).at n=36A096460
• Riordan array (f(x),x*f(x)) where f(x) is the g.f. of A117641.at n=56A171224
• Triangle T(n,k) read by rows: left edge is 0, 1, 2, ... (cf. A001477); otherwise each entry is sum of entry to left and entries immediately above it to left and right, with 1 for the missing right term at right edge.at n=50A224791
• Number of (n+1) X (6+1) 0..1 arrays with each 2 X 2 subblock having clockwise pattern 0000 0011 or 0101.at n=11A259220
• Number of pairs (lambda,mu) of partitions lambda of n and mu of four with mu <= lambda (by diagram containment).at n=26A303854
• Number of totally transitive rooted trees with n nodes.at n=26A318185
• Number of ways to write n as an ordered sum of 9 primes.at n=17A340965