22789

Appears in sequences

• Strong pseudoprimes to base 44.at n=18A020270
• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 17.at n=10A031605
• Triangle T(n, k) read by rows; given by [1, 1, 1, 1, 1, ...] DELTA [1, 1, 2, 5, 14, 42, 132, 429, 1430, ...] (A000108) where DELTA is Deléham's operator defined in A084938.at n=24A085843
• Number of (n+3) X 8 binary arrays with every 4 X 4 subblock commuting with each horizontal and vertical neighbor 4 X 4 subblock.at n=12A188101
• Composite numbers k such that k+A055012(k) is the cube of a prime.at n=3A328293
• Numbers N such that N + the sum of the cubes of its digits is again a third power.at n=22A362953
• a(n) = Sum_{k=0..n} floor(sqrt(k))^4.at n=45A363498