18804

Appears in sequences

• Number of ordered 5-tuples of integers from [ 2,n ] with no global factor.at n=16A015651
• Sin(n) decreases monotonically to -1.at n=31A046964
• Maximal number of regions into which 5-space can be divided by n hyperspheres.at n=18A059174
• Numbers k such that h(k) = h(k-1) + h(k-2), where h(k) = A006577(k) + 1 is the length of the sequence {k, f(k), f(f(k)), ...., 1} in the Collatz (or 3x + 1) problem. (The earliest "1" is meant.)at n=35A078418
• a(0)=1; a(n) is the smallest integer > a(n-1) such that sin(a(n)) is closer to an integer (here 0 or -1) than sin(a(n-1)).at n=30A079037
• Even numbers k such that if a person is born in year k and lives not more than 100 years, then he never celebrates his prime birthday on a prime year.at n=18A124658
• a(1) = 1, and for each k >=2, a(k) is the smallest number n such that n/cos(n) > a(k)/cos(a(k)), so that a(1)/cos(a(1)) > a(2)/cos(a(2)) > ... > a(k)/cos(a(k)) > ...at n=41A172446
• a(1) = 1, and for each n >=2, a(n) is the smallest number such that 1/cos(a(n)) < 1/cos(k) for all k < n, so that 1/cos(a(1)) > 1/cos(a(2)) > ... > 1/cos(a(n)) > ...at n=30A172448
• Number of (w,x,y,z) with all terms in {0,...,n} and |w-x|<|x-y|<|y-z|.at n=18A212902
• Unique integers appearing in A066135, in order of appearance.at n=25A218860
• Number of length-(n+1) 0..3 arrays with new repeated values introduced in sequential order starting with zero.at n=6A268256
• T(n,k)=Number of length-(n+1) 0..k arrays with new repeated values introduced in sequential order starting with zero.at n=42A268261
• Number of length-(7+1) 0..n arrays with new repeated values introduced in sequential order starting with zero.at n=2A268266
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 873", based on the 5-celled von Neumann neighborhood.at n=24A273709
• First 5-digit number to appear n times in the decimal expansion of Pi.at n=29A277171
• First 5-digit number to appear n times in the decimal expansion of Pi.at n=30A277171
• Numbers k such that 10^k - 800001 is prime.at n=18A288822
• Sum of the third largest parts in the partitions of n into 7 parts.at n=41A308931
• Positions of records in A366091.at n=49A366065
• Number of tetrahedra in the n X n queen graph.at n=11A388998