129640

Appears in sequences

• Vampire numbers (definition 2): numbers n with an even number of digits which have a factorization n = i*j where i and j have the same number of digits and the multiset of the digits of n coincides with the multiset of the digits of i and j.at n=27A014575
• A triangle of numbers related to triangle A030524.at n=23A049352
• 324n^2 + 2n.at n=19A158271
• a(n) = 1600*n^2 + 40.at n=8A158775