Three codes could be found in the HTML source of the Prime Fragments post on the Investigate Ingress blog.

[1] xqqh99ggi83sqb7

[2] 100033ans7ue93ugm18110

[3] 5v5v5f5f5lv57fv5v5f5l5f5l45u6f5v57u6lf5f5v54t

Code #1

Observations

Right amount of numbers for a passcode and yes there is a keyword in there even if there is only one vowel.

Spoiler

Make a 3×5 grid

`x`	`q`	`q`
`h`	`9`	`9`
`g`	`g`	`i`
`8`	`3`	`s`
`q`	`b`	`7`

Read left from the upper right Q

qqx99higgs387bq

Code #2

Observations

A lot of numbers but they are probably there just to throw you off. A simple manipulation will guide you to the passcode.

Spoiler

Make a 2×11 grid

`x`	`q`	`q`
`h`	`9`	`9`
`g`	`g`	`i`
`8`	`3`	`s`
`q`	`b`	`7`

Can you start to see the keyword? Magnus seems to be in there. Let’s reverse the bottom row

`1`	`0`	`0`	`0`	`3`	`3`	`a`	`n`	`s`	`7`	`u`
`e`	`9`	`3`	`u`	`g`	`m`	`1`	`8`	`1`	`1`	`0`

Read down from the upper left 1

10010108313magnus379ue

To get that prefix right you need to change the numbers 100 10 10 to roman numerals

cxx8313magnus379ue

Code #3

Observations

45 characters, seems like the same letters and numbers are used.

[hint]Counting will help you on this one after the first manipulation[/hint]

Spoiler

With a string like that morse is usually the first step, let’s see what it gives.

..... ...- ..... ...- ..... ..-. ..... ..-. ..... .-.. ...- ..... --... ..-. ...- ..... ...- ..... ..-. ..... .-.. ..... ..-. ..... .-.. ....- ..... ..- -.... ..-. ..... ...- ..... --... ..- -.... .-.. ..-. ..... ..-. ..... ...- ..... ....- -

Notice that there are a lot more dots than dashes? This cannot be coincidence. Let’s split at every dash.

........-

.......-

........-

.......-

.....-

-

.....-

....-

........-

.......-

.........-

.......-

......-

.......-

-

......-

.........-

.....-

-

.....-

-

.....-

....-

........-

.........-

-

Now count the dots for every each string. If there are no dots count 0. Then make pairs with the numbers

88 76 75 50 54 87 79 76 70 69 50 50 54 89 90

Convert decimal to Ascii

XNK26WOLFE226YZ

`1`	`0`	`0`	`0`	`3`	`3`	`a`	`n`	`s`	`7`	`u`
`e`	`9`	`3`	`u`	`g`	`m`	`1`	`8`	`1`	`1`	`0`

`1`	`0`	`0`	`0`	`3`	`3`	`a`	`n`	`s`	`7`	`u`
`e`	`9`	`3`	`u`	`g`	`m`	`1`	`8`	`1`	`1`	`0`

`1`	`0`	`0`	`0`	`3`	`3`	`a`	`n`	`s`	`7`	`u`
`e`	`9`	`3`	`u`	`g`	`m`	`1`	`8`	`1`	`1`	`0`

`1`	`0`	`0`	`0`	`3`	`3`	`a`	`n`	`s`	`7`	`u`
`e`	`9`	`3`	`u`	`g`	`m`	`1`	`8`	`1`	`1`	`0`

Code #1

Observations

Code #2

Observations

Code #3

Observations

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`1`	`0`	`0`	`0`	`3`	`3`	`a`	`n`	`s`	`7`	`u`
`e`	`9`	`3`	`u`	`g`	`m`	`1`	`8`	`1`	`1`	`0`

`1`	`0`	`0`	`0`	`3`	`3`	`a`	`n`	`s`	`7`	`u`
`e`	`9`	`3`	`u`	`g`	`m`	`1`	`8`	`1`	`1`	`0`