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"GRAHAM'S NUMBER," named after mathematician Ron Graham, is so vast that it held the world record for the largest number ever used in a serious mathematical proof. Graham's number is much larger than other large numbers such as a googol and a googolplex. In fact, the observable universe is far too small to contain a written representation of Graham's number.

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"Graham's Number . . . because size matters" T-Shirt
"Graham's Number . . . because size matters" T-Shirt
Sale Price £30.27. Original Price £40.35.
"Graham's Number . . . because size matters" T-Shirt
"Graham's Number . . . because size matters" T-Shirt
Sale Price £24.49. Original Price £32.65.
"MATH IS FUN!" T-Shirt
"MATH IS FUN!" T-Shirt
Sale Price £24.49. Original Price £32.65.
"GRAHAM'S NUMBER"
"GRAHAM'S NUMBER"
"GRAHAM'S NUMBER"
Sale Price £3.47. Original Price £3.85.
"GRAHAM'S NUMBER" T-Shirt
"GRAHAM'S NUMBER" T-Shirt
Sale Price £24.49. Original Price £32.65.