Successive prime differences: Difference between revisions
→{{header|J}}: simplify
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sequence_index=: [: I. E.
end_groups=: PRIMES {~ ({. , {:)@
HEAD=: <;._2 'group;tally;end occurrences;'
HEAD ,> INTERVALS
┌─────┬─────┬───────────────────────────┐
│group│tally│end occurrences │
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