33123

Appears in sequences

• Fibonacci numbers written in base 4.at n=16A004687
• Expansion of sum ( q^n / product( 1-q^k, k=1..5*n), n=0..inf ).at n=33A035297
• Squarefree numbers k with largest prime factor = floor(sqrt(k)).at n=30A071311
• Number of 3-almost primes t such that 2^n < t <= 2^(n+1).at n=17A120034
• Number of nXnXn triangular 0..3 arrays with no element equal to the sum or difference mod 4 of any two of its neighbors.at n=4A193833
• Numbers in A249406 that are not of the form m*(m+1).at n=3A249408
• a(n) = Fibonacci(n) represented in bijective base-4 numeration.at n=15A282235
• Least common multiple of 7*n+1 and 7*n-1.at n=26A282286
• Numbers k such that k!6 - 16 is prime, where k!6 is the sextuple factorial number (A085158).at n=16A289689
• a(n) = a(n-1) + a(n-2) + a([n/2]), where a(0) = 1, a(1) = 1, a(2) = 1.at n=21A298338
• The number of vertices on a concave circular triangle formed by the straight line segments mutually connecting all vertices and all points that divide the sides into n equal parts.at n=16A340686
• Long leg of the only primitive Pythagorean triple whose inradius is the n-th odd prime and whose short leg is an even number.at n=40A367335