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MathVerified logic

Random Number Generator

Generate repeatable or fresh integer sequences within an inclusive range, with duplicate and sort controls.

Random Number Inputs

A seed makes the sequence repeatable; leave blank for a fresh browser-generated sequence.

Results computed instantly — your data never leaves your device.

Random Number Results

Real-Time

Generated values

1, 58, 26, 45, 66

Range

1 to 100

Count

5

Mode

Repeatable seed

100% Client-SidePrivate & Secure

How to Use the Random Number Generator

  1. 1

    Set the inclusive minimum and maximum integers.

  2. 2

    Choose how many values to generate and whether repeats are allowed.

  3. 3

    Add a numeric seed for a repeatable sequence, or leave it blank for a fresh browser sequence.

  4. 4

    Review the generated list, range, count, and ordering.

Formula & Mathematical Basis

x = min + floor(u × (max − min + 1)), where u is a value from 0 up to but not including 1.

Variable Key

x

Generated integer

min/max

Inclusive range endpoints

u

Uniform pseudorandom unit value

📝 A seeded mode is repeatable but pseudorandom. It is not suitable for cryptographic secrets.

Step-by-Step Examples

1

Generate a repeatable integer list

Scenario: Use 1 to 100, five values, and seed 42.

  1. 1.Set the inclusive range.
  2. 2.Set the count to five.
  3. 3.Enter seed 42.
  4. 4.Run the generator and keep the resulting sequence for a reproducible test.
✅ The same settings produce the same sequence in this calculator; the exact values are intentionally not part of the public contract.

Practical Use Cases

  • Create sample values for a classroom exercise.
  • Reproduce a test case with a known seed.
  • Draw unique integers when the selected range is large enough.

Common Pitfalls

  • Treating a pseudorandom sequence as cryptographically secure.
  • Forgetting that the endpoints are included.
  • Requesting more unique values than the range can contain.

Frequently Asked Questions

Are the minimum and maximum included?

Yes. Integer generation uses an inclusive range.

Does a seed guarantee secure randomness?

No. It makes results repeatable and therefore predictable.

Can I generate unique values?

Yes, when the requested count does not exceed the number of integers in the range.

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