21268

Appears in sequences

• Trails of length n on square lattice.at n=9A006817
• Numbers k that divide 4^k + 4.at n=14A015889
• Pseudo-Kaprekar triples: q such that if q=x+y+z, then q^3=x*10^i + y*10^j + z, where (y*10^j+z < 10^i) and z < 10^j.at n=25A060768
• A hexagonal spiral Fibonacci sequence.at n=22A094926
• Numbers n, not divisible by 3, 5, 7 or 11, such that A000203(n)-n-1 and 2*n+1-A000203(n) are prime numbers.at n=9A180268
• Number of n X 3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,0,3,4,1 for x=0,1,2,3,4.at n=21A196205
• Expansion of Product_{k>=1} ((1 + k*x^k) / (1 + x^k)).at n=27A268500
• Sum of the asymmetry degrees of all compositions of n with parts in {2,1,3,5,7,9,...}.at n=15A275447
• Numbers that are the sum of eight fourth powers in nine or more ways.at n=18A345584
• Numbers that are the sum of eight fourth powers in ten or more ways.at n=7A345585