45847

Appears in sequences

• Strong pseudoprimes to base 68.at n=32A020294
• Strong pseudoprimes to base 99.at n=27A020325
• Numbers k such that the harmonic mean of the divisors of k is the square of a rational number.at n=13A074266
• Number of distinct Markov type classes of order 5 possible in binary strings of length n.at n=11A132300
• Lesser term of smallest primitive friendly pair such that both terms are divisible by the n-th prime p and coprime to the primes below p.at n=7A214132
• Numbers n such that sigma(n)/tau(n) is a perfect number.at n=15A219179
• a(n) = 7*n^3 - 6*n^2.at n=18A382251