Prime Gap Format
For a history of formatting and more details see
Tom Nicely’s original description.
The records reside in a sql script on Github. The schema is detailed in some length in
Details and rationale of schema creation.
The fields are fairly decriptive with the exception of "primecat", "gapcert", "ismax", and "isfirst".
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"ismax"
: is this gap a maximal gap (strictly exceeding in measure all the prime gaps preceding it)?
Values: 1 and 0
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"isfirst"
: is this the first gap of this size?
The character "F" signifies that the gap has definitely been established (by an exhaustive scan to or beyond that point) as a first occurrence prime gap.
Values: "F" and ""
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"primecat"
: The categorization (or classification) of the prime gap
The character "C" signifies conventional (common, classic, standard, regular, ordinary, normal) prime gaps.
At this time no other values are used.
Values: "C"
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"gapcert" (formerly "primecert")
: The certification of the bounding integers of the gap.
See For Details.
Most commonly "C" for bounds certified and internals double checked.
or "D" for bounds and internal double-checked with PRP.
Less frequentely "d" for bounds double-checked but internals not double-checked
or "t" for trusted discover where only bounds were tested.
Values: "C", "c", "D", "d", "t"