19119

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 92.at n=31A031590
• a(n) gives smallest number requiring n iterations of the map i -> A053392(i) to reach zero.at n=31A060630
• Numbers k such that k and k^2 use only the digits 1, 3, 5, 6 and 9.at n=21A137035
• Concatenation of n and a list of the divisors of n.at n=18A137464
• 1/6 the number of (n+2)X4 0..2 arrays with each 3X3 subblock containing one of one value, four of another, and four of the last.at n=3A184470
• 1/6 the number of (n+2)X6 0..2 arrays with each 3X3 subblock containing one of one value, four of another, and four of the last.at n=1A184472
• T(n,k)=1/6 the number of (n+2)X(k+2) 0..2 arrays with each 3X3 subblock containing one of one value, four of another, and four of the last.at n=11A184477
• T(n,k)=1/6 the number of (n+2)X(k+2) 0..2 arrays with each 3X3 subblock containing one of one value, four of another, and four of the last.at n=13A184477
• a(n) = 12*n^2 - 2*n - 1.at n=40A185918
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 149", based on the 5-celled von Neumann neighborhood.at n=30A270319
• 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=27A281745
• Numbers using only digits 1 and 9.at n=39A284294
• The number of even prime gaps g satisfying g == 2 (mod 6) out of the first 2^n even prime gaps.at n=16A341531
• Number of edges in the directed graph for the Reversed Zeckendorf game with starting number n.at n=48A389617
• Concatenations x||1||x for numbers x.at n=18A392225