This number is a prime.
The largest prime that cannot be expressed as the sum of five or fewer squared composite numbers.
Chicago psychologist Doctor Robert Hartley's suite number on the TV series The Bob Newhart Show is 715, but has appeared as 751 due to the rearrangement of digits by set designers.
7! - 5! - 1! is also prime! [Gevisier]
The smallest multidigit prime p such that p*2^p-1 is a Woodall prime. [Gupta]
751 is not a twin prime but 7#+5#± 1, 7#-5#± 1, and 7#*5#± 1, all are twin primes. [Vrba]
The number built with "expanded notation" in the classic
book MATHEMATICS by David Bergamini and the Editors
of LIFE (1963, p. 194), revealing to primary-graders how
large numbers are constructed of hundreds, tens, and units.
The smallest integer with the following property: the sum of digits of 751 = the sum of digits of the 751st prime = the sum of digits of the 751st semiprime. [Sedov and
The only known emirp n such that p = n*2^n-1 is a Woodall
751 is the smallest prime p such p and prime(p) have same
set of distinct digits. [Kumar]
Both numbers 751^(7+5+1) and 751^(7*5*1) end with 751. There exists only one other known prime with this property. [Firoozbakht]
The smallest prime (emirp) that can be represented as the
product of first n positive multiples of 5 plus 1, i.e.,
(There are 3 curios for this number that have not yet been approved by an editor.)
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