18412

Appears in sequences

• Denominators of convergents to Pi by Farey fractions.at n=30A063673
• Number of staircase polygons on the square lattice with perimeter 2n and one (possibly rotated) staircase polygonal hole.at n=5A073913
• Inverse Moebius transform of the shifted tetrahedral numbers.at n=44A116963
• Numbers k such that k^2 is a square arising in A154138.at n=11A156066
• Numbers n such that both n*Pi and n*e are within 1/sqrt(n) of integers.at n=36A208530
• Limit of rows in triangle A232433 when read in reverse order.at n=14A232434
• Numbers for which the cube of the sum of the digits is equal to the square of the product of their digits.at n=26A241846
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 659", based on the 5-celled von Neumann neighborhood.at n=23A273386
• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 611", based on the 5-celled von Neumann neighborhood.at n=14A283290
• a(n) = 144*2^n - 20 (n>=1).at n=6A304388
• Positive integers that have exactly ten representations of the form 1 + p1 * (1 + p2* ... * (1 + p_j)...), where [p1, ..., p_j] is a (possibly empty) list of distinct primes.at n=12A317400
• a(n) is the smallest number which can be represented as the sum of n distinct nonzero triangular numbers in exactly n ways, or 0 if no such number exists.at n=45A350288