40870

Appears in sequences

• First of triples of consecutive happy numbers, i.e., the first of three consecutive integers each of which is a happy number (A007770).at n=35A072494
• Numbers k such that (phi(k-2) + phi(k+2))/2 = phi(k); 2-phi/balanced numbers.at n=30A099633
• Numbers which when multiplied by any repunit prime Rp give a Smith number.at n=20A104167