219602

Appears in sequences

• Numerators of continued fraction convergents to sqrt(5).at n=9A001077
• Expansion of x*(1 + x - 2*x^2) / ( 1 - 4*x^2 - x^4).at n=19A059973
• Numbers k such that 5*k^2 + 5 is a square.at n=4A075796
• a(n) = Lucas(n) - floor(Lucas(n)/2).at n=27A173495
• Numbers k such that gpf(k^2+1)/k sets a new record of low value, where gpf(k) is the greatest prime dividing k (A006530).at n=28A173561
• a(n) = floor(Lucas(n+1)/2), Lucas(n) = A000032(n).at n=26A173714
• a(0)=a(1)=1, a(n+2) = a(n+1) + a(n) - A128834(n).at n=27A226956
• Positive integers n such that the Fibonacci (or Zeckendorf) representation of n^2 is a palindrome.at n=28A288252
• Rectangular array R read by descending antidiagonals: divide to each even term of the Wythoff array (A035513) by 2, and delete all others.at n=46A328695