78123

Appears in sequences

• a(n) = 2*(-1)^n - (-5)^n.at n=7A081628
• Numbers k such that (k+j) mod (2+j) = 1 for j from 0 to 8 and (k+9) mod 11 <> 1.at n=28A096026
• Semiprime nearest to 5^n. In case of a tie, choose the smaller.at n=7A117429
• a(n) = number of solutions to the Diophantine equation x+y^2+z^3=n^4 with positive x,y,z all distinct.at n=30A121984
• a(n) is the smallest number not yet in the sequence such that concatenation of all terms yields an infinite periodic stream of digits 1, 2, 3, ..., 8 (repeat from 1).at n=38A165306
• Numbers, a(n) where binomial(a(n), 5n-1) == 0 (mod 5) and binomial(a(n), k) != 0 (mod 5) for k != 5n - 1.at n=23A224251