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Let 
 be the first Prime which follows a Prime Gap of 
 between consecutive Primes.  Shanks'
conjecture holds that
See also Prime Difference Function, Prime Gaps
References
Guy, R. K.  Unsolved Problems in Number Theory, 2nd ed.  New York: Springer-Verlag, p. 21, 1994.
 
Rivera, C.  ``Problems & Puzzles (Conjectures): Shanks' Conjecture.''
  http://www.sci.net.mx/~crivera/conjectures/conj_009.htm.
 
Shanks, D.  ``On Maximal Gaps Between Successive Primes.''  Math. Comput. 18, 646-651, 1964.