Numbers /4
How rare is 4?
4 scores 1,287 and sits in the Singular tier — 1 in 111,111 of all supported numbers score this high or higher. Everything below is computed from a complete analysis of all 1,000,001 numbers in range.
RNGdle.net’s own rarity score. Top <0.01% means that proportion of supported numbers scores at least this high. Every exact number has the same chance of being rolled. How this differs from EP · Badge guide
These notes make the number easy to read, but they add no score unless a separately counted rarity signal appears below.
Only 10 of the 1,000,001 supported numbers have one digit.
Range · signal frequency
2 raised to an integer power.
Factorization · signal frequency
This number uses an uncommon count of distinct digits.
Repetition · signal frequency
This number's digits add up to an uncommon total.
Arithmetic · signal frequency
An integer squared.
Factorization · signal frequency
Divisible by the sum of its digits.
Arithmetic · signal frequency
The product of exactly two primes.
Factorization · signal frequency
Strongest signal: Single-digit number. It appears in 10 supported numbers and contributes +332 after correlation decay.
Why is 4 unusual? Only <0.01% of the 1,000,001 supported numbers receive an equal or higher rarity score. This number falls in the Singular tier. Scoring is grounded in the exact frequency of each detected trait — rarer traits carry more information and contribute more to the score.
Algorithm version 1.1.0
Patterns in this number
Each of these has its own page explaining how common the pattern is and why.
Harshad Numbers
A Harshad — or Niven — number is divisible by the sum of its own digits. 18 works because 1 + 8 = 9 and 18 ÷ 9 = 2.
Semiprime Numbers
A semiprime is a product of exactly two primes, counted with multiplicity — 15 = 3 × 5, and 49 = 7 × 7 counts too.
Perfect Squares
A perfect square is some whole number times itself: 144 = 12², 10000 = 100². The range ends neatly on 1,000,000 = 1000².
Powers of Two
Each power of two is double the last: 1, 2, 4, 8, 16, and on up through 1024, 65536 and 524288. Doubling exhausts the range in only twenty steps.