71905

Appears in sequences

• 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 59.at n=3A031647
• Positive numbers y such that y^2 is of the form x^2+(x+73)^2 with integer x.at n=13A160041
• Composite numbers n with the property that phi(n) divides (n-1)^2.at n=16A173703