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THE 42 INDEX

420-digit prime

420 digits

Recorded

Public post, 26 June 2025: “Wow, a prime number with 420 digits!” A grid of 1s and 8s, a G in the gaps.

The image Elon Musk posted: fourteen rows of white digits on black, mostly 8s with 1s forming a large G in the grid, over the line "is a prime with 420 digits".

ImagePOSTED BY ELON MUSK ON XJUNE 26, 2025

Elon posted a picture of digits arranged as a Grok G, and called it a prime with 420 digits. The 420 is the written count. The integer lives in the image.

What it supports

A dated public utterance. 26 June 2025. Status 1938242452458205467. Family is 420, digit count, not 42. Community checks followed. Grokipedia records the post and the glyph.

What it does not

Primality is not re-proved here. Some readers counted 420 cells in a 14 × 30 grid, including blanks, and a shorter decimal string. The caption is the object. The pictured integer is the exhibit. Not a physical 420. Not natal 4°20′.

ExactnessAuthored use

Form420

Unitdigits

Strengthhard

When2025-06-26

Source

Elon Musk, 26 Jun 2025

Owner

THE 42 INDEX