Experiments on the integer sequence A359012
A359012 consists of a sequence of numbers k that are a substring of xPy where k=concatenation(x,y) and xPy is the number of permutations.
If x,y,k are natural numbers and k is formed by the concatenation of the digits of x followed by those of y, i.e., k = concatenation(x,y), then k belongs to A359012, if xPy contains the number k.
The first eight numbers are given below:
| k | x | y | permutations |
|---|---|---|---|
| 318 | 31 | 8 | 318073392000 |
| 557 | 55 | 7 | 1022755734000 |
| 692 | 69 | 2 | 4692 |
| 729 | 72 | 9 | 30885807297945600 |
| 2226 | 222 | 6 | 111822261510960 |
| 2437 | 243 | 7 | 45853567243767360 |
| 2776 | 277 | 6 | 427763435299200 |
| 3209 | 320 | 9 | 31408938532094015692800 |
- John Samuel
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