91238

Appears in sequences

• Numbers k such that k | 12^k + 11^k + 1.at n=43A057293
• Expansion of x*(1-3*x)*(1-x)/(1-7*x+14*x^2-7*x^3).at n=9A122068
• Let spm(n) be the sum of all prime factors of n counted with multiplicities (A001414); sequence gives numbers n such that spm(n+spm(n)) divides both n and n+spm(n).at n=29A131564
• Numbers for which the number of prime divisors counted with multiplicity and the sum of the distinct prime divisors are both perfect.at n=31A233563