數學的問題....我要做科展的!

數學有某種規律...譬如:1 2 3 4 5=152 3 4 5 6 7=274 5 6 ... 28 29=429133 134 135 136 ... 533=133533第一個數字一直累加1

加到後面等於

前一ㄍ數字和後面那ㄍ數字的組合譬如:X (X 1) (X 2) (X 3) ... Y=XY注意:中間不可以有夾別ㄉ不屬於x或yㄉ數字會寫程式的人可以用c語言或別ㄉ語言幫我寫ㄇ??
提供幾組程式跑出來的結果------------------------------------------------------------------------- 15 = SUM( 1

5) 27 = SUM( 2

7) 429 = SUM( 4

29) 1353 = SUM( 13

53) 1863 = SUM( 18

63) 3388 = SUM( 33

88) 3591 = SUM( 35

91) 7119 = SUM( 7

119) 78403 = SUM( 78

403) 133533 = SUM( 133

533) 178623 = SUM( 178

623) 2282148 = SUM( 228

2148) 2732353 = SUM( 273

2353) 3882813 = SUM( 388

2813) 7103835 = SUM( 710

3835) 13335333 = SUM( 1333

5333) 17016076 = SUM( 1701

6076) 17786223 = SUM( 1778

6223) 27377889 = SUM( 2737

7889) 32738728 = SUM( 3273

8728) 35639163 = SUM( 3563

9163) 308725039 = SUM( 3087

25039) 347826603 = SUM( 3478

26603)1248851513 = SUM(12488

51513)1333353333 = SUM(13333

53333)1420855168 = SUM(14208

55168)1777862223 = SUM(17778

62223)-------------------------------------------------------------------------
暴力演算法

執行時會很慢的#include