20665

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has period 83.at n=16A020422
• Multiplicity of highest weight (or singular) vectors associated with character chi_83 of Monster module.at n=47A034471
• Centered 24-gonal numbers.at n=41A069190
• a(n) = a(n-1) + a(n-2) + 7 where a(0) = a(1) = 1.at n=17A111733
• Semiprimes in A054556.at n=20A113693
• Numbers k such that k concatenated with itself gives the product of two numbers which differ by 8.at n=9A116161
• Numbers k such that k concatenated with k+7 gives the product of two numbers which differ by 6.at n=5A116208
• Number of connected graphs with n edges embeddable into square lattice.at n=14A181528
• Number of (n+1) X 3 binary arrays with rows and columns in nondecreasing order and with no 2 X 2 subblock sum differing from a horizontal or vertical neighbor subblock sum by more than one.at n=25A184064
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 438", based on the 5-celled von Neumann neighborhood.at n=35A272219
• Let p = n-th prime == 7 mod 8; a(n) = sum of quadratic residues mod p that are > p/2.at n=17A282040
• Numbers k such that (19*10^k + 737)/9 is prime.at n=19A293536
• Numbers n such that there is precisely 1 group of order n, 2 of order n + 1 and 3 of order n + 2.at n=14A296024
• Number of nX6 0..1 arrays with every element unequal to 1, 2, 5, 6 or 8 king-move adjacent elements, with upper left element zero.at n=9A305514