160416

Appears in sequences

• Numbers that have exactly eight prime factors counted with multiplicity (A046310) whose digit reversal is different and also has 8 prime factors (with multiplicity).at n=20A109028
• Values of n such that (sigma(sigma(n))-phi(phi(n)))/n is an integer (the corresponding integral ratios are given in A136132).at n=33A136131
• Numbers n such that n and n^4 are sums of two twin primes.at n=23A212430