2D palindrome
A palindromic sat number that uses exactly two distinct digits, such as 101, 1,221 or 9,889: one of the palindrome categories the site tracks everywhere.
How a sat qualifies
A sat is a 2D palindrome when its decimal number reads the same both ways (a palindrome) and uses exactly two distinct digits. 101, 1,221, 9,889 and 3,443,443 qualify. 12,321 has three distinct digits, so it is a 3D palindrome; 1,111 has one, a 1D palindrome.
The digits counted are the distinct ones, not the length: 1,000,000,001 is a 2D palindrome of ten digits.
Overlaps
The types are assigned independently, so a sat can be in more than one palindrome category. A 2D palindrome built from a shorter palindrome repeated, such as 101,101 or 121,121, is also a perfect palinception and counts in both categories. A 2D palindrome can also sit in a historic range, such as block 9 or pizza.
2009
The 2D palindromes mined in blocks 0 to 32,489 (the 2009 blocks) are 2D palindromes in 2009: 20,359 of the 30,934 (see 2D palindrome 2009). Short numbers, mined first, are where palindromes with few distinct digits are densest.
How many
Will ever exist: 30,934. Mined so far: 30,902. Addresses holding one: 7,153. Extracted, held alone in small outputs: 1,433.
Supply and market
| Category | Will exist | Mined | Extracted | Last sale | Floor |
|---|---|---|---|---|---|
| 2D palindrome | 30,934 | 30,902 | 1,433 | 290,000 sats | 290,000 sats |
As of block 972,427. Prices are per sat.