27293

Appears in sequences

• Fibonacci sequence beginning 5, 14.at n=17A022139
• Composite numbers whose prime factors contain no digits other than 5 and 7.at n=32A036320
• Number of primes <= 10^(n/2).at n=11A122121
• Sequence starting with 1 such that the sum of any two distinct terms has three distinct prime factors.at n=9A181622
• Number of primes up to 10^(n/4).at n=22A210518
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 813", based on the 5-celled von Neumann neighborhood.at n=27A273640
• Triangle read by rows: T(n,k) is the coefficient of x^k in the ZZ polynomial of the hexagonal graphene flake O(3,3,n).at n=20A338158
• Triangle read by rows: T(n,k) is the coefficient of x^k in the ZZ polynomial of the hexagonal graphene flake O(3,4,n).at n=13A338244