19911

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 94.at n=35A031592
• Numbers k such that 129*2^k-1 is prime.at n=37A050590
• Nearest integer to n^tan(n).at n=17A054672
• a(n) = Sum_{k=0..n} (-1)^(n-k)*k*Stirling2(n,k).at n=11A101851
• Indices of primes in the sequence defined by A(0) = 29, A(n) = 10*A(n-1) - 31 for n > 0.at n=7A101963
• Number of permutations of length n which avoid the patterns 2134, 3421, 4132.at n=11A116833
• a(n) = A121295(n) - A121263(n).at n=18A131011
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (0, 1, -1), (1, 0, 0), (1, 0, 1)}.at n=9A149879
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 547", based on the 5-celled von Neumann neighborhood.at n=26A272840
• Numbers k with the property that the square root of the product of the digits of k is equal to the sum of the square roots of its digits.at n=29A281745
• Numbers using only digits 1 and 9.at n=42A284294
• Number of partitions of n into an odd number of parts that are not multiples of 3.at n=54A339405
• Number of integer partitions of n whose odd parts are relatively prime.at n=37A366850
• Number of mutual-visibility sets in the n-ladder graph.at n=17A389183