64021

Appears in sequences

• Numbers k such that the digits of k^2 are exactly the same (albeit in different order) as the digits of (k+1)^2.at n=20A072841
• Expansion of (1-x-2x^2+sqrt(1-2x-3x^2))/(2(1-x)(1-2x-3x^2)).at n=11A116409
• Partial sums of A299277.at n=40A299278