# Consecutive primes with ascending or descending differences

```ruby
func runs(f, arr) {
 
    var run = 0
    var diff = 0
    var diffs = []
 
    arr.each_cons(2, {|p1,p2|
        var curr_diff = (p2 - p1)
        f(curr_diff, diff) ? ++run : (run = 1)
        diff = curr_diff
        diffs << run
    })
 
    var max  = diffs.max
    var runs = []
 
    diffs.indices_by { _ == max }.each {|i|
        runs << arr.slice(i - max + 1, i + 1)
    }
 
    return runs
}
 
var limit = 1e6
var primes = limit.primes
 
say "Longest run(s) of ascending prime gaps up to #{limit.commify}:"
say runs({|a,b| a > b }, primes).join("\n")
 
say "\nLongest run(s) of descending prime gaps up to #{limit.commify}:"
say runs({|a,b| a < b }, primes).join("\n")
```

#### Output:

```
Longest run(s) of ascending prime gaps up to 1,000,000:
[128981, 128983, 128987, 128993, 129001, 129011, 129023, 129037]
[402581, 402583, 402587, 402593, 402601, 402613, 402631, 402691]
[665111, 665113, 665117, 665123, 665131, 665141, 665153, 665177]

Longest run(s) of descending prime gaps up to 1,000,000:
[322171, 322193, 322213, 322229, 322237, 322243, 322247, 322249]
[752207, 752251, 752263, 752273, 752281, 752287, 752291, 752293]
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://trizen.gitbook.io/sidef-lang/programming_tasks/c/consecutive_primes_with_ascending_or_descending_differences.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.