59815

Appears in sequences

• a(n) = a(n-2) + a(n-3), with a(0) = 0, a(1) = 1, a(2) = 2.at n=40A007307
• Numbers whose base-9 representation has exactly 6 runs.at n=25A043635
• Numbers n such that phi(n+1) = reverse(phi(n)).at n=6A074241
• Numbers n such that reverse(phi(n+1)) = phi(n).at n=7A075475
• Number of possible positions for n discs on a standard 7 X 6 board of Connect-Four.at n=7A090224
• Expansion of (1-x-2*x^2)/(1-x^2+x^3).at n=44A109248
• a(n) = A098601(2n) + A098601(2n+1).at n=19A137495
• a(n) = 3*a(n-1) - 2*a(n-2) + a(n-3), n > 3.at n=13A137584
• Records in heights of cyclotomic polynomials (A160338).at n=21A160339
• Number of binary strings of length n with no substrings equal to 0010 0101 or 1010.at n=15A164494
• The Wiener index of the straight pentachain of n pentagonal rings (see Fig. 2.1 in the A. A. Ali et al. reference).at n=30A224459
• Numbers k with the property that it is possible to write the base 2 expansion of k as concat(a_2,b_2), with a_2>0 and b_2>0 such that, converting a_2 and b_2 to base 10 as a and b, we have sigma(a + b) = sigma(k).at n=23A258843