177270

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 28.at n=30A031706
• Sequence defined by the recurrence formula a(n+1)=sum(a(p)*a(n-p)+k,p=0..n)+l for n>=1, with here a(0)=1, a(1)=10, k=0 and l=-2.at n=7A177172
• Number of double palindrome structures of length n using exactly three different symbols.at n=18A328689