21394

Appears in sequences

• Number of irreducible representations of the symmetric group S_n such that their degree is divisible by 3.at n=36A061569
• Number of fault-free tilings of a 4 X 2n rectangle with L tetrominoes.at n=12A084481
• Numbers k such that 6*p(k)*p(k+1)*p(k+2)*p(k+3)*p(k+4)*p(k+5)-1 and 6*p(k)*p(k+1)*p(k+2)*p(k+3)*p(k+4)*p(k+5)+1 are twin primes with p(h) = h-th prime.at n=28A129311
• Numbers n such that sopfr(n) - (floor(sqrt(n))*bigomega(n)) = floor(sqrt(n)).at n=20A180877
• The sum of the necessary diagonal movements from each square unit of an n X n+1 rectangle to reach any of the corners of the rectangle.at n=33A279034
• Number of partitions of n into a squarefree number of squarefree parts.at n=50A286330
• Numbers k such that k and 4k, taken together, contain all digits 1 though 9 at least once.at n=38A346135
• G.f. A(x) satisfies A(x) = 1 / (1 - x - x^3 * A(x^3)).at n=24A367667