37989

Appears in sequences

• a(n) = least natural number k such that f(k) begins a maximal zigzag of length n in the prime gaps function f(x) = p(x+1)-p(x), where p(x) denotes the x-th prime. (Cf. A066485.)at n=18A066918
• Starting positions of strings of three 4's in the decimal expansion of Pi.at n=28A083615
• Number of maximal sum-free subsets of {1,2,...,n}.at n=38A121269
• a(n) is the smallest number such that a(n)*n is an anagram of a(n)*3.at n=23A175692
• Positive integers m with 2^(m-1)*phi(m) - 1 prime, where phi(.) is Euler's totient function.at n=32A236375