2,5,12,27?
2007-01-02 16:12:19 · 9 answers · asked by Nafertiti 2 in Science & Mathematics ➔ Mathematics
can you help me report him? the guy with the blue hair http://answers.yahoo.com/question/index;_ylt=AqUfwKjGkkLGaOxZQB11pt3sy6IX?qid=20070102210803AA6AJnt&show=7#profile-info-ecd42c8261751f426584440ee9fa1808aa
2007-01-02 16:17:42 · update #1
... 58, 121, 248, 503, 1014, 2037...
The difference between terms is 3, 7, 15, 31, 63, etc. These are all one less than a power of 2 (4, 8, 16, 32, 64, etc.)
2007-01-02 16:14:47 · answer #1 · answered by Puzzling 7 · 2⤊ 0⤋
58. I agree with Puzzling (and who wouldn't, he's level 6 and his face looks like a Rubic's Cube =)
The rule seems to be that the ith term is the previous term doubled, plus i-1. That is 5 = 2*2+1, 12 = 2*5 + 2, 27 = 2*12 + 3, and 58 = 2*27 + 4. Or, if you prefer a closed formula, the ith term is equal to 2^(i+1) - (i+1), for example, the 5th term is 2^(5+1) - (5+1) = 64 - 6 = 58.
2007-01-03 00:21:19 · answer #2 · answered by Phineas Bogg 6 · 0⤊ 0⤋
58
2007-01-03 02:13:10 · answer #3 · answered by 75345 2 · 0⤊ 0⤋
the number will be 54 as in
2,5,12,27,.....
5-2=3
12-5=7
27-12=15
---------------
difference of the differences,
7-3=4
15-7=8
therefore next no. will be with a difference 12.
so, the next difference between the differences of the nos. of the series will be 12+15=27
the last given no. of the series is 27
so,27+27=54
2007-01-03 00:22:43 · answer #4 · answered by NANDITA 1 · 0⤊ 0⤋
2*27+4 = 58
To get the next term you multiply by 2 and add 1, then 2, then 3, etc..
So the next term will be 2*58+5=121 etc...
Have reported him.
2007-01-03 00:20:24 · answer #5 · answered by martina_ie 3 · 0⤊ 0⤋
2, 5, 12, 27, 54, 104, 192, 340, 585, 982, 1610, 2590, 4097, 6378, 9792, 14848
Number of ways to partition 4*n+3 into distinct positive integers
2007-01-03 00:31:12 · answer #6 · answered by gjmb1960 7 · 0⤊ 0⤋
you double the number then add 1, 2, 3, etc.
2, 2(2) + 1 = 5, 5(2) + 2= 12, 12(2) + 3=27, etc.
2007-01-03 00:16:31 · answer #7 · answered by Michelle 3 · 1⤊ 0⤋
58.
2007-01-03 00:16:50 · answer #8 · answered by chemchic 1 · 0⤊ 0⤋
58
Multiply the first number by two add one, multiply the result by 2, add two, multiply that by two, add three...etc.
2007-01-03 00:17:59 · answer #9 · answered by The answer guy 3 · 0⤊ 0⤋