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The pentakulus is equal to \(5\&5\&5\&5\&5 = \{ 5,5 /2 \}\) using the array of operator and BEAF.[1] The term was coined by Cookie Fonster. The number is derived from triakulus and the Greek word "penta" for five. It is possibly (after heptakulus) the second largest googolism which is a perfect power, but neither a square nor a cube.

## Approximations in other notations

Notation Approximation
Bird's array notation \(\{5,5 [1 [1 [1 [2 \backslash_{3} 3 \backslash_{4} 2] 2] 2] 2] 2\}\)

## Sources

1. Pointless Gigantic List of Numbers - Part 6: The Mighty RoyalsPointless Large Number Stuff. Retrieved 2017-05-23.