81504

Appears in sequences

• Smallest number such that the concatenation of first n terms is a proper multiple of the concatenation of first n natural numbers.at n=5A074108
• Number of reduced 3 X 3 semimagic squares with magic sum n.at n=33A173728
• Numbers k such that 3k - 1 divides 3^k - 1.at n=33A273614
• Numbers k such that 313*2^k+1 is prime.at n=17A322948