7
This number is a prime.
Single Curio View: (Seek other curios for this number)
There are 72 natural numbers n
such that n is equal to the number of 7's in the decimal
digits of all numbers smaller or equal to n. [Capelle]
Submitted: 2009-06-25 06:58:16; Last Modified: 2009-06-25 08:52:44.
Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell