120779959

Properties

Appears in sequences

• Number of ways to arrange integers 1 through n so that the sum of each adjacent pair is prime, not counting reversals.at n=19A051239
• Number of ways of writing the numbers 1 .. n in a sequence so that the sum of any two adjacent numbers is a prime; reversing the sequence does not count as different.at n=19A064821
• Prime numbersat n=6883475