28129

Appears in sequences

• Crystal ball sequence for D_8 lattice.at n=3A008362
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 90 ones.at n=32A031858
• 100000n+1, 100000n+3, 100000n+7, 100000n+9 are all primes.at n=8A064964
• Average of three successive primes squared, (prime(n)^2+prime(n+1)^2+prime(n+2)^2)/3, n>=3.at n=35A075893
• a(n) = least semiprime such that all subsets of {a(1),...,a(n)} have a different sum.at n=14A137371
• Number of binary strings of length n with no substrings equal to 0001 0011 or 0100.at n=15A164453
• Numbers that are 5-digit palindromes in at least two bases.at n=34A180454
• L.g.f.: Sum_{n>=1} (x^n/n)/sqrt(1 - 2*(2*x)^n) = Sum_{n>=1} a(n)*x^n/n.at n=7A184513
• Number of distinct eigenvalues of n X n matrices with elements {0, 1}.at n=4A306784
• Greatest eigenvalues of the form x + y*sqrt(z) of the Fibonacci matrix of the form n X n = [[F(0),F(1),...,F(n-1)],[F(n),F(n+1),...,F(2n-1)],...,[F(n(n-1)),F(n(n-1)+1),...,F(n^2-1)]] represented by the triples of integers (x, y, z).at n=11A320975