2147516415

Appears in sequences

• Number of reversible string structures with n beads using exactly two different colors.at n=32A056326
• Numbers having in binary representation a leading 1 followed by n zeros and n-1 ones.at n=15A092431
• Expansion of (1-3*x+3*x^2)/(1-5*x+10*x^2-10*x^3+4*x^4).at n=31A098179
• Numbers k such that (1/k)*sigma(k+1) is an integer.at n=5A110817
• a(n) is the smallest positive integer m with exactly n zeros and exactly n ones in its binary representation and with n represented in binary as a substring of the binary representation of m.at n=15A147762
• a(n) = 6*a(n-1) - 8*a(n-2)-3 for n > 1; a(0) = 35, a(1) = 135.at n=13A171473
• a(n) = (2^n - (-1+i)^n - (-1-i)^n)/4 - 1 where i is the imaginary unit.at n=32A275016