286965

Appears in sequences

• Numbers n such that 51*2^n-1 is prime.at n=30A050551
• a(n) = number of n-lettered words in the alphabet {1, 2, 3} with as many occurrences of the substring (consecutive subword) [1, 1, 1] as of [1, 2, 2].at n=12A211284