divisible by

New in version 1.14.2: The divisible by test was added in Twig 1.14.2 as an alias for divisibleby.

divisible by checks if a variable is divisible by a number:

{% if loop.index is divisible by(3) %}
    ...
{% endif %}

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https://twig.symfony.com/doc/1.x/tests/divisibleby.html