This number is a composite.
In some casinos, five 7's is a big winner. Note that the sum of the first 77777 odd primes is an 11-digit prime. "7 come 11"! [Green]
In some casinos, five 7's is a big winner. Note that the sum of the first 77777 odd primes is an 11-digit prime. "7 come 11"! [Green]