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A comment on The Pursuit of Beauty: Yitang Zhang solves a pure-math mystery. Parent comment

Re:The Pursuit of Beauty: Yitang Zhang solves a pure-math my... by a3_nm on Friday February 13, 2015 @08:29PM (#9048325)
The definition given in the article is an informal shortcut, the complete definition is http://mathworld.wolfram.com/DeletablePrime.html and 1987 is indeed a deletable prime (see http://oeis.org/A080608/b080608.txt for http://oeis.org/A080608).
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