19613

Appears in sequences

• T(n,n-1), array T as in A047130.at n=9A047133
• T(n,n-2), array T as in A047130.at n=9A047134
• Discriminants of real quadratic fields with class number 1 and related continued fraction period length of 22.at n=47A051963
• Number of positions that are exactly n moves from the starting position in the Bicube or Bandaged Rubik's Cube puzzle.at n=24A079771
• Minimal peaks in digital expansions of Pi: positions of peaks equal to 1.at n=18A105275
• a(n) = 4 + floor(Sum_{k=1..n-1} a(k) / 2).at n=21A120134
• Number of nondecreasing Dyck paths of semilength n and having no peaks at even level (n>=0). A nondecreasing Dyck path is a Dyck path for which the sequence of the altitudes of the valleys is nondecreasing.at n=15A121485
• Greedy Coppersmith-Winograd sequence.at n=25A172161
• The least semiprime (A001358) such that between it and the next n semiprimes, but not the next n+1 semiprimes, there are no primes.at n=18A228170
• Number of partitions of n such that each part is no more than 3 more than the sum of all smaller parts.at n=37A286929
• a(n) is the smallest number k such that the difference between the next prime greater than k and k equals n.at n=47A309877
• Numbers k such that k and 4k, taken together, contain all digits 1 though 9 at least once.at n=32A346135
• Numbers k such that k^5*2^k + 1 is a prime.at n=9A367421