59397

Appears in sequences

• a(n) = Sum_{d|3} phi(d)*n^(3/d).at n=39A054602
• Given n, let S denote the set of numbers c_1*c_2*...*c_n where 1<=c_1<=c_2<=...<=c_n<=n; a(n) = number of members of S that have a unique representation of this form.at n=15A160375
• Numbers such that, in base 10, all their proper prefixes and suffixes represent primes.at n=42A254751
• Composite numbers with only prime proper prefixes and suffixes in base 10.at n=32A254753