22125

Appears in sequences

• Fibonacci sequence beginning 3, 12.at n=17A022380
• Numbers having four 3's in base 9.at n=10A043468
• Thickened pyramidal numbers: a(n) = 2*(n+1)*n + Sum_{i=1..n} (4*i*(i-1) + 1).at n=25A050533
• Semiperimeter of primitive Pythagorean triangles having legs that add up to a square, sorted on hypotenuse.at n=19A089549
• Numbers k such that triangular(k) - x and y - triangular(k) are both triangular numbers (A000217), where x is the nearest square below triangular(k), y is the nearest square above triangular(k).at n=27A234143
• Arithmetic derivative of the primorial base exp-function: a(n) = A003415(A276086(n)).at n=29A327860
• Denominator of ratio A003415(n) / A003415(A276086(n)), where A003415 is the arithmetic derivative and A276086 is the primorial base exp-function.at n=28A369039