Composite number
Composite number
Integer having a non-trivial divisor.
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Readers' pathsAug 2026 – Oct 2026
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Prime number
Number divisible only by 1 and itself.
15%
Natural number
Number used for counting.
12%
Divisor
Integer that divides another integer.
8.2%
Fundamental theorem of arithmetic
Integers have unique prime factorizations.
7.3%
Weird number
Number that is abundant but not semiperfect.
5%
Square-free integer
Number without repeated prime factors.
4.7%
Perfect number
Number equal to the sum of its proper divisors.
2.6%
Abundant number
Number that is less than the sum of its proper divisors.
2.4%
Cuisenaire rods
Learning aid for mathematics.
2.2%
On-Line Encyclopedia of Integer Sequences
Online database of integer sequences.
2%
Readers come from
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Prime number
Number divisible only by 1 and itself.
46%
666 (number)
Natural number.
3.6%
33 (number)
Natural number.
1.9%
28 (number)
Natural number.
1.8%
Integer factorization
Decomposition of a number into a product.
1.8%
Fundamental theorem of arithmetic
Integers have unique prime factorizations.
1.7%
69 (number)
Natural number.
1.7%
55 (number)
Natural number.
1.7%
Sieve of Eratosthenes
Ancient algorithm for generating prime numbers.
1.5%
38 (number)
Natural number.
1.5%