22569

Appears in sequences

• Centered 4-dimensional orthoplex numbers (crystal ball sequence for 4-dimensional cubic lattice).at n=13A001846
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 92 ones.at n=14A031860
• Denominators of continued fraction convergents to sqrt(605).at n=10A042161
• Number of nodes in virtual, "optimal", chordal graphs of diameter 4 and degree n+1.at n=24A067956
• Average of 4 primes where the integer Schwarzian derivative is zero.at n=22A094903
• Triangle T, read by rows, that satisfies the recurrence: T(n,k) = [T^3](n-1,k-1) + [T^3](n-1,k) for n>k>=0, with T(n,n)=1 for n>=0, where T^3 is the matrix third power of T.at n=25A113084
• Semiprimes q such that q^2-4 and q^2+4 are also semiprimes.at n=18A173084
• Numbers n such that m=(n^2+1)/2, p=(m^2+1)/2 and q=(p^2+1)/2 are all prime.at n=14A188546
• Numbers k such that sum of digits of k = sum of digits of anti-divisors of k.at n=14A213239
• a(n) = Sum_{1 <= i, j, k <= n} gcd(i,j,k).at n=25A344522
• Numbers with five neighboring primes on the hexagonal spiral board of odd numbers.at n=23A345654
• Row sums of irregular triangle A381587.at n=22A381358
• a(n) = Sum_{k=0..n} 2^k * binomial(n,k) * binomial(3*n+1,k).at n=4A388045
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where A(n,k) = Sum_{j=0..n} binomial(n,j) * binomial(k*n+j+1,n).at n=32A388052