26206

Appears in sequences

• Numbers k such that phi(k) + 2 | sigma(k + 2).at n=24A015781
• Numbers k such that sigma(k+2) = 2*sigma(k-2).at n=4A067135
• Partial sums of floor(2^n/5).at n=15A178452
• Semiprimes that are the sum of 10 consecutive primes.at n=33A185347
• Number of -n..n arrays x(0..3) of 4 elements with zero sum and nonzero first and second differences.at n=16A200456
• G.f.: Product_{k>=1} (1 + x^k) / (1 - x^(k*(k+1))).at n=47A280424
• 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 489", based on the 5-celled von Neumann neighborhood.at n=17A282609
• Numbers k such that (8*10^k - 611)/9 is prime.at n=17A295399
• Number of winning positions for the next player (a, b, c) where 1 <= a, b, c <= n in "Divisor Nim" (see comments).at n=32A383226