19558

Appears in sequences

• Sums of 4 distinct powers of 7.at n=13A038483
• Numbers n for which there are exactly five k such that n = k + reverse(k).at n=39A072429
• Number of permutations in S_n avoiding {bar 5}1342 (i.e., every occurrence of 1342 is contained in an occurrence of a 51342).at n=8A137544
• Monotonic ordering of nonnegative differences 3^i-5^j, for 40>= i>=0, j>=0.at n=32A192149
• Number of -n..n arrays x(0..2) of 3 elements with nonzero sum and with zero through 2 differences all nonzero.at n=13A200166
• Third-order spt function.at n=13A221141
• Number of partitions p of n such that exactly one number is in both p and its conjugate.at n=45A240675
• a(n) = Sum_{k=1..n} tau(gcd(k,n))^(n/gcd(k,n)), where tau(n) is the number of divisors of n.at n=23A344195