Parsing json with jq.

gistfile1.txt

$ cat test.json
[
  {
    "kind": "workspace",
    "id": 672699,
    "name": "Iteration 0",
    "person_id": 2179801,
    "project_ids": [
      1968761,
      1968571,
      1966561,
      1969757,
      1968697,
      1968861
    ]
  }
]

$ cat test.json | jq '.[].project_ids'
[
  1968761,
  1968571,
  1966561,
  1969757,
  1968697,
  1968861
]

I want to get: 

1968761
1968571
1966561
1969757
1968697
1968861


This works: 
cat test.json | jq '.[].project_ids' | perl -lane 'print $1 if (/(\d+)/)'
1968761
1968571
1966561
1969757
1968697
1968861

Want it in jq instead.

cat test.json | jq '.[].project_ids | .[]'

→ cat test.json
[
{
"kind": "workspace",
"id": 672699,
"name": "Iteration 0",
"person_id": 2179801,
"project_ids": [
1968761,
1968571,
1966561,
1969757,
1968697,
1968861
]
}
]

→ cat test.json | jq '.[].project_ids | .[]'
1968761
1968571
1966561
1969757
1968697
1968861