23213

Appears in sequences

• Denominators of continued fraction convergents to sqrt(696).at n=12A042339
• Numbers having four 5's in base 8.at n=12A043444
• a(n) = ((n+1)^2*(n-1)*a(n-1)+(-1)^(n+1))/n.at n=4A074702
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 0), (0, 1, -1), (1, -1, 0), (1, 1, 1)}.at n=8A149703
• Number of length 6+2 0..n arrays with every three consecutive terms having the sum of some two elements equal to twice the third.at n=17A248439
• Palindromic numbers in bases 2 and 8 written in base 10.at n=50A259380
• Semiprimes whose prime factors are of equal binary length and which differ from each other in exactly three bit positions.at n=40A261075
• Nonprime squarefree numbers whose prime indices all have the same Omega (A001222) and the same sum of prime indices (A056239).at n=13A327908
• Numbers that are both binary palindromes and binary Smith numbers.at n=39A334530
• a(n) is the numerator of Sum_{k=0..n} (-1)^k / (k!)^2.at n=6A354304