What are semiprime numbers?

Semiprime numbers are integers equal to a product of exactly two primes, such as 4, 6, 9, 10, 14, 15, 21, or 25.

No. 8 = 2×2×2 has three prime factors counting multiplicity.

Is there a Semiprime badge in RNGdle?

Not as a dedicated badge today. Look the number up in the calculator to see which other pattern badges and EP it earns.

RNGdle is a free browser game where you generate one random number from 0 to 1,000,000 each day. Instead of guessing words, RNGdle analyzes your roll for numerical patterns, awards badges, and scores EP (entropy points) so every daily number feels like a collectible result.

How does RNGdle scoring work?

RNGdle scoring adds EP from every badge your number unlocks. Badges in the same family supersede each other—only the highest-EP badge in that family counts—then your total EP ranks the roll from Trash and Common up through Rare, Epic, Anomaly, and Mythic.

How do you play RNGdle?

To play RNGdle, open the site and press GENERATE for today's official roll. Review the badges, check your EP and rarity tier, share the result if you like, then return after midnight for a fresh daily number.

What RNGdle badges can you get?

RNGdle badges cover mathematical and novelty patterns: perfect powers, consecutive digit runs, pairs and of-a-kind sets, palindromes, zero/void ladders, pi and e slices, plus meme exacts like Nice (69), Botanist (420), and Jackpot (777). New rolls can unlock many badges at once.

Is RNGdle a daily game?

Yes. RNGdle is a daily game with one official GENERATE per calendar day. After you roll, the next official number unlocks after midnight, which keeps each day's result unique and shareable.

What features are local in this RNGdle version?

In this RNGdle version, your daily roll, badge collection, lifetime EP, theme preference, and recent history are stored locally in the browser. You can play without creating an account; clearing site data resets local progress.

GuideSemiprimes

Semiprime Numbers

A semiprime is a natural number that is the product of exactly two primes, not necessarily distinct. So 4 = 2×2, 6 = 2×3, 9 = 3×3, and 15 = 3×5 all count; 8 = 2×2×2 does not.

210,035 values in 0–1,000,000

Formula

n = p × q with primes p, q (exactly two prime factors counting multiplicity).

How to check

Factor n completely. Count prime factors with multiplicity; the count must be exactly two.

Example

91
91 = 7×13, two primes, so it is semiprime. 8 = 2×2×2 has three factors and is not.

Look up EP for this number in the calculator.

In RNGdle

Semiprimes sit between primes and highly composite numbers. RNGdle does not ship a dedicated Semiprime badge today, but the pattern still helps you read a roll — and the calculator will surface every other badge that fires.

Examples across the range

210,035 total · 36 samples spaced from low to high.

427,78155,55883,337111,113138,895166,673194,449222,231250,003277,783305,561333,338361,115388,893416,671444,451472,229500,007527,783555,563583,354611,119638,899666,673694,451722,229750,007777,785805,571833,341861,119888,897916,681944,455972,238

FAQ

What are semiprime numbers?: Semiprime numbers are integers equal to a product of exactly two primes, such as 4, 6, 9, 10, 14, 15, 21, or 25.
Is 8 a semiprime?: No. 8 = 2×2×2 has three prime factors counting multiplicity.
Is there a Semiprime badge in RNGdle?: Not as a dedicated badge today. Look the number up in the calculator to see which other pattern badges and EP it earns.