23210

Appears in sequences

• a(n) = Sum_{k=0..n} A026626(n, k).at n=14A026633
• a(n) = Sum_{k=0..floor(n/2)} A026626(n, k).at n=15A026634
• Numbers whose base-2 representation has exactly 14 runs.at n=13A043581
• Numbers k such that x = 2^k-2 satisfies phi(x)+2 = phi(x+2).at n=25A050475
• n written efficiently in natural numbers base, i.e., in form ...wxyz where n = 1*z + 2*y + 3*x + 4*w + ... with z <= 1, y < 2, x < 3, w < 4, ...at n=29A055611
• n written efficiently in natural numbers base, i.e., in form ...wxyz where n =1*z + 2*y + 3*x + 4*w + ... with z < 1, y < 2, x < 3, w < 4, ...at n=28A055992
• Numbers n such that 4*10^n + 1 is prime.at n=14A056806
• Sequence A014486 shown in base 4.at n=34A085185
• Number of partitions of n in which number of least parts is equal to least part.at n=47A096403
• Sequence representing valid nontrivial 1-dimensional Hashi (a.k.a. Bridges or Hashiwokakero) puzzle orientations.at n=40A143964
• Indices of pentagonal pyramidal numbers which are the sum of two other such numbers: k such that A002411(k) = A002411(i)+A002411(j) for some i,j>0.at n=35A172437
• Number of strictly increasing arrangements of 7 nonzero numbers in -(n+5)..(n+5) with sum zero.at n=8A188126
• Decimal representation of the middle column of the "Rule 59" elementary cellular automaton starting with a single ON (black) cell.at n=14A266721
• Number of oriented circulant graphs of order n up to Cayley isomorphism.at n=23A283189
• Number of integer compositions of n that (1) have all parts > 1 and (2) are not the first sums of any finite nonnegative sequence.at n=24A391679