23396

Appears in sequences

• Integers n > 1997 such that the 'Reverse and Add!' trajectory of n joins the trajectory of 1997.at n=38A063055
• Numbers n such that (2^p + 1)/3 is prime, where p is the n-th prime.at n=36A123176
• Numerators of the continued fraction convergents of the decimal concatenation of the prime-indexed primes.at n=15A128850
• Number of 2n-vertex 4-dissections on a cylinder.at n=3A169996
• Inverse of coefficient array of orthogonal polynomials P(n,x)=(x-2n)*P(n-1,x)-(2n-3)*P(n-2,x), P(0,x)=1,P(1,x)=x-2.at n=41A178121
• Number of 4-step S, E, and NW-moving king's tours on an n X n board summed over all starting positions.at n=34A187509
• Numbers n such that n, p=prime(n) and q=prime(p) have the same sum of digits.at n=39A261142