27401

Appears in sequences

• Numbers k such that lcm(1,2,3,...,k)/13 equals the denominator of the k-th harmonic number H(k).at n=27A112818
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 149", based on the 5-celled von Neumann neighborhood.at n=33A270319
• Number of irredundant sets in the n-pan graph.at n=17A291107
• a(n) = A178901(n)/n.at n=19A339711
• Non-Brauer numbers.at n=16A349044