9066121

Appears in sequences

• Prime powers (A025475) whose decimal digit reversal is also a prime power.at n=20A226035
• Numbers n such that both sigma(n) and sigma(n) - 2 are primes.at n=16A274963
• a(n) is the smallest number k such that sigma(k) and sigma(k^n) are both primes.at n=13A299148
• Number of permutations tau of {1,...,n} such that k^2 + tau(k)^2 is prime for every k = 1,...,n.at n=21A321610