PRIME SMARANDACHE EXPRESSION
Definition:
x2 x3 x1
E(n) = x1 + x2 + ... + xn , where n >= 2, with x1, x2, ..., xn > 1
and have the greatest common divisor 1.
There are infinitely many composite numbers of this form.
Unsolved Problem: Are there finitely or infinitely many primes of
this form?
References: y x
[1] Castillo, J., "Primes of the form x + y ", ,
Vol. 29, No. 1, 1996/7, p. 21.
[2] Castini, Peter, Letter to the Editor, , Vol. 28,
No. 3, 1995/6, p. 68.
[3] Luca, Florian, "Products of Factorials in Smarandache Type Expressions",
, Vol. 8, No. 1-2-3, 1997, pp. 29-41.
[4] Luca, Florian, "Perfect Powers in Smarandache Type Expressions",
, Vol. 8, No. 1-2-3, 1997, pp. 72-89.