18951

Appears in sequences

• Denominators of continued fraction convergents to sqrt(397).at n=9A041755
• a(n) = a(1) + a(2) + ... + a(n-1) + a(m) for n >= 4, where m = 2^(p+1) + 2 - n and p is the unique integer such that 2^p < n-1 <= 2^(p+1), starting with a(1) = a(2) = 1 and a(3) = 4.at n=14A049945
• Number of objects generated by the Combstruct grammar defined in the Maple program. See the link for the grammar specification.at n=9A052879
• Sums of p-th to the q-th prime where p and q are twin primes.at n=31A114379
• Numbers such that the sum of the factorials of the digits of the fourth power is a square.at n=29A126077
• Smallest number k > 0 such that k^n + 1 has exactly n distinct prime factors.at n=13A219018
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 165", based on the 5-celled von Neumann neighborhood.at n=29A270459
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 413", based on the 5-celled von Neumann neighborhood.at n=29A272009
• Least k such that k^n + 1 is the product of n distinct primes (k > 0).at n=13A281940