90915

Appears in sequences

• Numbers n such that the middle coefficient of the cyclotomic polynomial Phi_n(x) has a value not obtained for any smaller n.at n=40A095877
• Products of 5 distinct primes a,b,c,d,e, such that a+b+c+d+e are prime numbers.at n=24A178782
• Sum of the first n strobogrammatic numbers.at n=33A230833
• Members of a pair (m,k) such that sigma(m) = sigma(k) = sigma(m+k), m < k where sigma = A000203.at n=37A239436
• Numbers k such that k and k+1 have at least 4 but not both exactly 4 distinct prime factors.at n=22A321494