In Steins;Gate, there's a scene where a message is sent to a pager. The message is:
yasai kuu to genki na ko wo umeru 野菜食うと元気な子を産める
If [you] eat vegetables, [you] birth a healthy child.
Converted to kana:
やさいくうとげんきなこをうめる
Converted to numbers:
*2*228131123134524040322512502137493
Apparently, this is based on the gojuuon 五十音 input of key pads. Everything after *2*2 is converted to kana. And each kana is represented by two digits, a row-column combination.
If you press 1, you get the vowel row, a-i-u-e-o あいうえお, so 11 = a, 12 = i, 13 = u, 14 = e, 15 = o. If you press 2, you get the ka-row, ka-ki-ku-ke-ko かきくけこ, so 23 = ku, for example.
Furthermore, diacritics are input separately, so they take an extra 2 digits
In the anime, the original message was too long to be sent, and Okabe had to change the word taberu たべる, "to eat," to kuu くう, which is a synonymous word used more by men. (see: female language.)
Based on this, the code shown in the anime is wrong.[８話Ｑ＆Ａと小ネタ - w.atwiki.jp, accessed 2020-02-09]
The correct code is:
*2*281311223134524040322512502137493
Observe:
81, 31, 12
や, さ, い
ya, sa, i
23, 13, 45,
く, う, と
ku, u, to
24, 04, 03, 22, 51
け, ゛, ん, き, な
げ, ん, き, な
ge, n, ki, na
