0 + 1 = 1
1 + 2 = 3
3 + 3 = 6
6 + 4 = 10
10 + 5 = 15
15 + 6 = 21
21 + 7 = 28
28 + 8 = 36
36 + 9 = 45
45 + 10 = 55
55 + 11 = 66
66 + 12 = 78
78 + 13 = 91
91 + 14 = 105
105 + 15 = 120
120 + 16 = 136
136 + 17 = 153
153 + 18 = 171
171 + 19 = 190
190 + 20 = 210
210 + 21 = 231
231 + 22 = 253
253 + 23 = 276
276 + 24 = 300
300 + 25 = 325
325 + 26 = 351
351 + 27 = 378
378 + 28 = 406
406 + 29 = 435
435 + 30 = 465
465 + 31 = 496
496 + 32 = 528
528 + 33 = 561
561 + 34 = 595
595 + 35 = 630
630 + 36 = 666
666 + 37 = 703
703 + 38 = 741
741 + 39 = 780
780 + 40 = 820
820 + 41 = 861
861 + 42 = 903
903 + 43 = 946
946 + 44 = 990
990 + 45 = 1035
1035 + 46 = 1081
1081 + 47 = 1128
1128 + 48 = 1176
1176 + 49 = 1225
1225 + 50 = 1275
1275 + 51 = 1326
1326 + 52 = 1378
1378 + 53 = 1431
1431 + 54 = 1485
1485 + 55 = 1540
1540 + 56 = 1596
1596 + 57 = 1653
1653 + 58 = 1711
1711 + 59 = 1770
1770 + 60 = 1830
1830 + 61 = 1891
1891 + 62 = 1953
1953 + 63 = 2016
2016 + 64 = 2080
2080 + 65 = 2145
2145 + 66 = 2211
2211 + 67 = 2278
2278 + 68 = 2346
2346 + 69 = 2415
2415 + 70 = 2485
2485 + 71 = 2556
2556 + 72 = 2628
2628 + 73 = 2701
2701 + 74 = 2775
2775 + 75 = 2850
2850 + 76 = 2926
2926 + 77 = 3003
3003 + 78 = 3081
3081 + 79 = 3160
3160 + 80 = 3240
3240 + 81 = 3321
3321 + 82 = 3403
3403 + 83 = 3486
3486 + 84 = 3570
3570 + 85 = 3655
3655 + 86 = 3741
3741 + 87 = 3828
3828 + 88 = 3916
3916 + 89 = 4005
4005 + 90 = 4095
4095 + 91 = 4186
4186 + 92 = 4278
4278 + 93 = 4371
4371 + 94 = 4465
4465 + 95 = 4560
4560 + 96 = 4656
4656 + 97 = 4753
4753 + 98 = 4851
4851 + 99 = 4950
4950 + 100 = 5050
0 + 1 = 1
1 + 2 = 3
3 + 3 = 6
6 + 4 = 10
10 + 5 = 15
15 + 6 = 21
21 + 7 = 28
28 + 8 = 36
36 + 9 = 45
45 + 10 = 55
55 + 11 = 66
66 + 12 = 78
78 + 13 = 91
91 + 14 = 105
105 + 15 = 120
120 + 16 = 136
136 + 17 = 153
153 + 18 = 171
171 + 19 = 190
190 + 20 = 210
210 + 21 = 231
231 + 22 = 253
253 + 23 = 276
276 + 24 = 300
300 + 25 = 325
325 + 26 = 351
351 + 27 = 378
378 + 28 = 406
406 + 29 = 435
435 + 30 = 465
465 + 31 = 496
496 + 32 = 528
528 + 33 = 561
561 + 34 = 595
595 + 35 = 630
630 + 36 = 666
666 + 37 = 703
703 + 38 = 741
741 + 39 = 780
780 + 40 = 820
820 + 41 = 861
861 + 42 = 903
903 + 43 = 946
946 + 44 = 990
990 + 45 = 1035
1035 + 46 = 1081
1081 + 47 = 1128
1128 + 48 = 1176
1176 + 49 = 1225
1225 + 50 = 1275
1275 + 51 = 1326
1326 + 52 = 1378
1378 + 53 = 1431
1431 + 54 = 1485
1485 + 55 = 1540
1540 + 56 = 1596
1596 + 57 = 1653
1653 + 58 = 1711
1711 + 59 = 1770
1770 + 60 = 1830
1830 + 61 = 1891
1891 + 62 = 1953
1953 + 63 = 2016
2016 + 64 = 2080
2080 + 65 = 2145
2145 + 66 = 2211
2211 + 67 = 2278
2278 + 68 = 2346
2346 + 69 = 2415
2415 + 70 = 2485
2485 + 71 = 2556
2556 + 72 = 2628
2628 + 73 = 2701
2701 + 74 = 2775
2775 + 75 = 2850
2850 + 76 = 2926
2926 + 77 = 3003
3003 + 78 = 3081
3081 + 79 = 3160
3160 + 80 = 3240
3240 + 81 = 3321
3321 + 82 = 3403
3403 + 83 = 3486
3486 + 84 = 3570
3570 + 85 = 3655
3655 + 86 = 3741
3741 + 87 = 3828
3828 + 88 = 3916
3916 + 89 = 4005
4005 + 90 = 4095
4095 + 91 = 4186
4186 + 92 = 4278
4278 + 93 = 4371
4371 + 94 = 4465
4465 + 95 = 4560
4560 + 96 = 4656
4656 + 97 = 4753
4753 + 98 = 4851
4851 + 99 = 4950
4950 + 100 = 5050