54538

Appears in sequences

• Numbers k such that k * (k + 8) is the concatenation of a number m with itself.at n=10A116292
• a(n) = n*(5*n - 3)*(25*n^2 - 15*n - 6)/8.at n=8A264891
• Heptagonal numbers which are products of four distinct primes.at n=6A351867