75290

Appears in sequences

• Number of primes less than 10^n with initial digit 3.at n=6A073515
• Numbers n such that sigma(n)=2n-phi(phi(n)).at n=35A110073
• The number of edges inside a cross with width 3 and height n (see Comments in A331455 for definition) formed by the straight line segments mutually connecting all vertices and all points.at n=20A330851
• Integers k such that k + 1 has a divisor that is an anagram of k, which must have the same number of digits as k.at n=33A384597