222070

Appears in sequences

• Appending a digit to n^2 gives another perfect square.at n=23A031150
• Numbers k such that 10*k^2 + 9 is a square.at n=11A075836
• Numerators of convergents to 3/(1 + sqrt(10)).at n=21A093611
• Define a(1)=1. Thereafter a(n) is the smallest positive integer with the property that a(n)^2 cannot be created by summing the squares of at most n values chosen among the previous terms (with repeats allowed).at n=23A111302