22829

Appears in sequences

• Super-4 Numbers (4 * n^4 contains substring '4444' in its decimal expansion).at n=20A032744
• Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1110-0100-0111 pattern in any orientation.at n=11A146872
• Denominator of the harmonic mean of the first n composite numbers.at n=12A250133
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 51", based on the 5-celled von Neumann neighborhood.at n=32A270020
• Indices of Ulam prime triples, where u(k), u(k+1) and u(k+2) are all primes, and u(k) = A002858(k) are the Ulam numbers.at n=11A307330
• a(1) = 1 and thereafter a(n) = a(n-1) + j(n-1) where j(1) = 1 and then j(n) = j(n-1)-1 if a(n) is composite or j(n) = 2*j(n-1) if a(n) is prime.at n=41A382671
• Odd semiprimes p*q, such that Stern polynomial B(p*q,x) is a product of B(p,x) and B(q,x).at n=48A391256