27062

Appears in sequences

• a(n)-th prime is the smallest prime containing exactly n 3's.at n=5A037058
• Numbers having four 6's in base 8.at n=10A043448
• a(n) = a(n-1) + a(m) for n >= 4, where m = 2*n - 2 - 2^(p+1) and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = 1, a(2) = 2, and a(3) = 1.at n=41A050043
• Ulam numbers such that n/2 is also an Ulam number.at n=19A068799
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 363", based on the 5-celled von Neumann neighborhood.at n=34A268154