663552

Appears in sequences

• Denominator of sum of -5th powers of divisors of n.at n=23A017674
• Numbers of form 6^i*8^j, with i, j >= 0.at n=31A025627
• Orders of finite Abelian groups having the incrementally largest numbers of nonisomorphic forms (A046054).at n=21A046055
• Expansion of 1/(1 - 2*x^2 - 2*x^3).at n=25A052907
• Card-matching numbers (Dinner-Diner matching numbers).at n=25A059061
• Card-matching numbers (Dinner-Diner matching numbers).at n=32A059067
• Numbers k such that sigma(k) - tau(k) is a prime.at n=9A065061
• Numbers n such that A017666(n)=phi(n).at n=19A069058
• 17-almost primes (generalization of semiprimes).at n=7A069278
• 3 people at a party are saying Hello to each other. Person 1 says Hello. Person 2 counts the times Hello has been said and says Hello twice that number. Person 3 says Hello 3 times the sum of Hello's and then it is Person 1 again. This is how many Hello's each person says.at n=13A076505
• Expansion of 2*x*(1+4*x+8*x^2)/(1-24*x^3).at n=12A076508
• a(n) = the least number which is the average of two consecutive primes and has exactly n prime factors (counted with multiplicity).at n=15A092576
• Smallest number beginning with 6 and having exactly n prime divisors counted with multiplicity.at n=16A106426
• Numbers k such that previous_prime(k)=k-sd and next_prime(k)=k+sd where sd is sum of the distinct prime factors of k.at n=18A125841
• Totally multiplicative sequence with a(p) = 8*(p+1) for prime p.at n=39A166648
• Numbers k that have measure of smoothness J larger than 7, where J = log(k)/log(rad(k)) and rad(k) is the product of the distinct prime divisors of k (A007947).at n=31A172422
• Number of n X n 0..1 arrays with every element equal to a diagonal or antidiagonal reflection.at n=4A209586
• T(n,k)=Number of n X n 0..k arrays with every element equal to a diagonal or antidiagonal reflection.at n=14A209593
• Number of 5X5 0..n arrays with every element equal to a diagonal or antidiagonal reflection.at n=0A209596
• Least number of the form 11*m-1 with exactly n prime factors, counted with multiplicity.at n=16A225210