40495867769
domain: N
Appears in sequences
- Numbers k such that the concatenation of k with itself is a biperiod square.at n=3A102567
- Numbers k such that k concatenated with k-9 gives the product of two numbers which differ by 6.at n=13A116098
- Numbers k such that k concatenated with k-4 gives the product of two numbers which differ by 4.at n=13A116129