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* 약수의 합은 20이다.
* 8번째 [[소수 (수론)|소수]]이다. 앞의 소수 [[17]]과 [[쌍둥이 소수]]이고, 다음 소수는 [[23]]이다. [[홀수]]이기도 하다.
제작 : 코레일 1호선 구로~ 병점 구간
1/19 = 052631578+947368421=999999999
2/19 = 105263157+894736842=999999999
3/19 = 157894736+842105263=999999999
4/19 = 210526315+789473684=999999999
5/19 = 263157894+736842105=999999999
6/19 = 315789473+684210526=999999999
7/19 = 368421052+631578947=999999999
8/19 = 421052631+578947368=999999999
9/19 = 473684210+526315789=999999999
10/19 = 526315789+473684210=999999999
11/19 = 578947368+421052631=999999999
12/19 = 631578947+368421052=999999999
13/19 = 684210526+315789473=999999999
14/19 = 736842105+263157894=999999999
15/19 = 789473684+210526315=999999999
16/19 = 842105263+157894736=999999999
17/19 = 894736842+105263157=999999999
18/19 = 947368421+052631578=999999999
1/19 = 052631578947368421
2/19 = 105263157894736842
3/19 = 157894736842105263
4/19 = 210526315789473684
5/19 = 263157894736842105
6/19 = 315789473684210526
7/19 = 368421052631578947
8/19 = 421052631578947368
9/19 = 473684210526315789
10/19 = 526315789473684210
11/19 = 578947368421052631
12/19 = 631578947368421052
13/19 = 684210526315789473
14/19 = 736842105263157894
15/19 = 789473684210526315
16/19 = 842105263157894736
17/19 = 894736842105263157
18/19 = 947368421052631578
1/19 = 052631578947368421
2/19 = 1+=5263157894736843
4/19 = 21+0526315789473684
8/19 = 421+052631578947368
16/19 = 8421+05263157894736
13/19 = 68421+0526315789473
7/19 = 368421+052631578947
14/19 = 7368421+05263157894
9/19 = 47368421+0526315789
18/19 = 947368421+052631578
17/19 = 8947368421+05263157
15/19 = 78947368421+0526315
11/19 = 578947368421+052631
3/19 = 1578947368421+05263
6/19 = 31578947368421+0526
12/19 = 631578947368421+052
5/19 = 2631578947368421+05
10/19 = 52631578947368421+0
십팔놈 == 천국갈놈 ^^
== 과학 ==
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