41067

Appears in sequences

• Odd numbers k that divide phi(k)*sigma(k).at n=24A015706
• Numbers k that divide 7^k + 5^k.at n=34A045596
• Numbers n such that n | 9^n + 8^n + 7^n + 6^n + 5^n + 4^n.at n=37A057260
• Total number of edges in all trees on n nodes.at n=13A095349
• Numbers of the form (3^i)*(13^j).at n=27A107364
• Numbers that factorize into a prime number of factors all raised to different prime exponents and no number appears both as an exponent and as a prime factor.at n=11A114131
• Powerful(1) numbers (A001694) that are sums of distinct factorials.at n=15A115645
• Row sums of triangle A136579.at n=8A136580
• a(n) = Sum_{k=0..n} (2*k)!.at n=4A138525
• Number of n X n arrays of squares of integers with every 3X3 subblock summing to 17.at n=1A159218
• Number of n X n arrays of squares of integers with every (n-1)X(n-1) subblock summing to 17.at n=1A159400
• Numbers k such that sigma(tau(k)) = rad(k).at n=9A173582
• Product of the 5th power of a prime and different distinct prime of the 2nd power (p^5*q^2).at n=16A179646
• Numbers of the form 20*k+7 which are three times a square.at n=23A192328
• a(n) = (n^2 + 2*(Sum_{j = 1..n} j^n)) (mod n^3).at n=38A219540
• Number of nX2 arrays of occupancy after each element moves to some king-move neighbor, without move-in move-out straight through or left turns.at n=5A221746
• T(n,k)=Number of nXk arrays of occupancy after each element moves to some king-move neighbor, without move-in move-out straight through or left turns.at n=22A221749
• T(n,k)=Number of nXk arrays of occupancy after each element moves to some king-move neighbor, without move-in move-out straight through or left turns.at n=26A221749
• The Wiener index of the linear phenylene with n hexagons.at n=12A224454
• a(n) = n*prime(prime(n)) - prime(n).at n=39A230285