78035

Appears in sequences

• Numbers which form a prime by appending a 3-digit odd number and form no primes by appending any 1- or 2-digit odd number not beginning with 0.at n=14A091089
• Numbers k such that (phi(k-2) + phi(k+2))/2 = phi(k); 2-phi/balanced numbers.at n=36A099633
• Primefree centuries (i.e., numbers k such that no prime exists between 100*k and 100*k+99).at n=18A181098
• Numbers which form a prime by appending a 3-digit number and form no primes by appending 1 digit or 2 digits.at n=8A365813