18862

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 78 ones.at n=21A031846
• Numbers having four 7's in base 9.at n=2A043484
• Conjectured record-breaking numbers of odd elements, for ascending positive integers k, in primitive cycles of positive integers under iteration by the Collatz-like 3x+k function.at n=29A226673
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 627", based on the 5-celled von Neumann neighborhood.at n=25A273276
• Expansion of Product_{k=1..10} (1+x^(2*k-1))/(1-x^(2*k)).at n=51A316722
• The sum of the numbers on straight lines of incrementing length n when drawn over numbers of the square spiral, where each line contains numbers which sum to the minimum possible value, and each number on the spiral can only be in one line. If two or more lines exist with the same sum the one containing the smallest number is chosen.at n=28A340974
• a(n) is the number of distinct solution sets to the quadratic equations u*x^2 + v*x + w = 0 with integer coefficients u, v, w, abs(u) + abs(v) + abs(w) <= n having a nonnegative discriminant.at n=36A379597