19959

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 47.at n=39A031545
• Numbers k such that k divides the (right) concatenation of all numbers <= k written in base 19 (most significant digit on right).at n=24A061948
• Row sums of (numerator) triangle A119947.at n=8A119949
• Number of partitions of n such that (greatest part) + (least part) > number of parts.at n=39A237870
• Number of length 3+1 0..n arrays with the sum of the maximum of each adjacent pair multiplied by some arrangement of +-1 equal to zero.at n=33A250647
• Main diagonal of Unlucky array: a(n) = A255543(n,n).at n=25A255549
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 187", based on the 5-celled von Neumann neighborhood.at n=30A270675
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 237", based on the 5-celled von Neumann neighborhood.at n=30A270982
• Numbers n such that the Collatz iterations for n and n + 1 have the same length (A078417) but do not meet a certain condition. (See comments.)at n=31A274410
• Odd numbers k such that phi(k) and cototient(k) have the same prime signature.at n=23A280927
• Number of integer partitions of n whose parts all divide n and whose length also divides n.at n=72A326842
• Number of partitions of n with at most four part sizes.at n=43A364793
• Number of subsets of {1..n} whose cardinality cannot be written as a nonnegative linear combination of the elements.at n=18A367223