90828

Appears in sequences

• If p and q are twin primes then pq + 1 is always divisible by 3, except for (p,q)=(3,5). Sequence gives values of (pq + 1)/3.at n=23A165280
• Number of arrangements of 3 nonzero numbers x(i) in -n..n with the sum of trunc(x(i)/x(i+1)) equal to zero.at n=38A189546
• Number of ways to reciprocally link elements of an 3 X n array either to themselves or to exactly two horizontal or antidiagonal neighbors.at n=10A220633
• Number of nX3 0..1 arrays with every element equal to 2, 3, 5 or 8 king-move adjacent elements, with upper left element zero.at n=15A298254
• Integers whose arithmetic derivative is equal to their Dedekind function.at n=14A301939
• Numbers such that the list of exponents of their factorization is a palindromic list of primes.at n=16A322525
• Numbers k for which A344998(k) = A344999(k).at n=18A345003
• Conductor of the elliptic curve y^2 = x^3 + n.at n=28A356730