32724

Appears in sequences

• Triangle of "Harmonic Coefficients" T(n,k), read by rows: (Sum_{i=1..n} T(n,i) * k^i) * k! / ((n+k)! * n!) = (Sum_{i=1..k} (1/i-1/(i+n)) = n * (Sum_{i=1..k} 1/(i*(i+n)))).at n=19A027858
• Number of asymmetric n-ominoes in n-2 space.at n=11A036366
• Numbers k such that the product of Euler phi of the 2 consecutive integers {k,k+1} is a 4th power: if sqrt(sqrt(phi(k)*phi(k+1))) is an integer, then k is here.at n=12A082788
• a(n) = A088760(n+1)/A088760(n).at n=16A088761
• a(n) = 4*2^n - 3*n - 5.at n=13A109363
• Numbers m such that m*reversal(m) contains every decimal digit exactly once.at n=20A178929
• Composites whose prime factorization in base 5 is an anagram of the number in base 5.at n=18A260049
• Numbers k such that sopfr(k + sopfr(k)) = sopfr(k) + sopfr(sopfr(k)), where sopfr = A001414.at n=34A376851
• Smallest k for which a chain of linked rods of length 1, ..., k can be folded in half in exactly n dictinct ways.at n=41A390056