211457

Properties

Appears in sequences

• Least prime factor of 2^(2^n) + 5^(2^n).at n=8A122119
• Xmas tree primes.at n=44A195302
• Sorted list of prime factors of numbers of the form 5^(2^m) + 2^(2^m) with m >= 0.at n=13A294133
• a(n) is the prime or perfect or amicable or sociable number encountered in the aliquot sequence for 2^n.at n=17A358415
• Prime numbersat n=18931