251231

Properties

Appears in sequences

• Number of strings of n+2 numbers x(i) in -6..6 with the sum of x(i) equal to zero and the sums of x(i)*x(i+1) and x(i)*x(i+2) equal to each other.at n=5A184058
• Primes p such that 2p^2-1, 3p^2-2, 4p^2-3, and 5p^2-4 are also prime.at n=4A213107
• Indices of records in A210693.at n=34A391871
• Prime numbersat n=22139