Sitting down with a peice of paper after finishing the book, I soon found it filled with numbers. Let me share a few with you.
Let’s start with the squares.
12=1, 22=4, 32=9, 42=16, 52=25, 62=36, 72=49, 82=64, 92=81, 102=100, 112=121, 122=144, 132=169, 142=196, 152=225, 162=256, 172=289, 182=324, 192=361, 202=400
Moving onto the cubes we find,
13=1, 23=8, 33=27, 43=64, 53=125, 63=216, 73=343, 83=512, 93=729, 103=1000, 113=1331, 123=1728, 133=2197, 143=2744, 153=3375, 163=4096, 173=4913, 183=5832, 193=6859, 203=8000
Raising to the power of 4 yields,
14=1, 24=16, 34=81, 44=256, 54=625, 64=1296, 74=2401, 84=4096, 94=6561, 104=10000, 114=14641, 124=20736, 134=28561, 144=38416, 154=50625, 164=65536, 174=83521, 184=104976, 194=130321, 204=160000
Looking to the power of 5ths,
15=1, 25=32, 35=243, 45=1024, 55=3125, 65=7776, 75=16807, 85=32768, 95=59049, 105=100000, 115=161051, 125=248832, 135=371293, 145=537824, 155=759375, 165=1048576, 175=1419857, 185=1889568, 195=2476099, 205=3200000
And lastly at the power of 6ths.
16=1, 26=64, 36=729, 46=4096, 56=15625, 66=46656, 76=117649, 86=262144, 96=531441, 106=1000000, 116=1771561, 126=2985984, 136=4826809, 146=7529536, 156=11390625, 166=16777216, 176=24137569, 186=34012224, 196=47045881, 206=64000000
This does give quite a array of numbers.
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Let’s take this a step further.
Starting with the squared differences,
4-1=3, 9-4=5, 16-9=7, 25-16=9, 36-25=11, 49-36=13, 64-49=15, 81-64=17, 100-81=19, 121-100=21, 144-121=23, 169-144=25, 196-169=27, 225-196=29, 256-225=31, 289-256=33, 324-289=35, 361-324=37, 400-361=39
The cubed differences are as follows,
8-1=7, 27-8=19, 64-27=37, 125-64=61, 216-125=91, 343-216=127, 512-343=169, 729-512=217, 1000-729=271, 1331-1000=331, 1728-1331=397, 2197-1728=469, 2744-2197=547, 3375-2744=631, 4096-3375=721, 4913-4096=817, 5832-4913=919, 6859-5832=1027, 8000-6859=1141
The differences raised to the 4th power are,
16-1=15, 81-16=65, 256-81=175, 625-256=369, 1296-625=671, 2401-1296=1105, 4096-2401=1695, 6561-4096=2465, 10000-6561=3439, 14641-10000=4641, 20736-14641=6095, 28561-20736=7825, 38416-28561=9855, 50625-38416=12209, 65536-50625=14911, 83521-65536=17985, 104976-83521=21455, 130321-104976=25345, 160000-130321=29679
The differences raised to the 5th power are,
32-1=31, 243-32=211, 1024-243=781, 3125-1024=2101, 7776-3125=4651, 16807-7776=9031, 32768-16807=15961, 59049-32768=26281, 100000-59049=40951, 161051-100000=61051, 248832-161051=87781, 371293-248832=122461, 537824-371293=166531, 759375-537824=221551, 1048576-759375=289201, 1419857-1048576=371281, 1889568-1419857=469711, 2476099-1889568=586531, 3200000-2476099=723901
And lastly, the differences raised to the 6th power are,
64-1=63, 729-64=665, 4096-729=3367, 15625-4096=11529, 46656-15625=31031, 117649-46656=70993, 262144-117649=144495, 531441-262144=269297, 1000000-531441=468559, 1771561-1000000=771561, 2985984-1771561=1214423, 4826809-2985984=1840825, 7529536-4826809=2702727, 11390625-7529536=3861089, 16777216-11390625=5386591, 24137569-16777216=7360353, 34012224-24137569=9874655, 47045881-34012224=13033657, 64000000-47045881=16954119
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Summarizing:
Squared:
1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39
Cubed:
1, 7, 19, 37, 61, 91, 127, 169, 217, 271, 331, 397, 469, 547, 631, 721, 817, 919, 1027, 1141
Quadratic:
1, 15, 65, 175, 369, 671, 1105, 1695, 2465, 3439, 4641, 6095, 7825, 9855, 12209, 14911, 17985, 21455, 25345, 29679
To the 5th,
1, 31, 211, 781, 2101, 4651, 9031, 15961, 26281, 40951, 61051, 87781, 122461, 166531, 221551, 289201, 371281, 469711, 586531, 723901
To the 6th,
1, 63, 665, 3367, 11529, 31031, 70993, 144495, 269297, 468559, 771561, 1214423, 1840825, 2702727, 3861089, 5386591, 7360353, 9874655, 13033657, 16954119
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Reviewing the squared sequence, the assigned difference can be represented as:2*X+1.
2*0+1=1, 2*1+1=3 2*2+1=5, 2*3+1=7, 2*4+`=9, 2=5+1=11, 2*6+1=13, 2*7+1=15, 2*8+1=17, 2*9+1=19, 2*10+1=21, etc.
What is not as obvious is for the cubed sequence: X2+(X+1)(2*X+1)
02+(0+1)(2*0+1)=1, 12+(1+1)(2*1+1)=7, 22+(1+1)(2*1+1)=7, 22+(2+1)(2*2+1)=19, 32+(3+1)(2*3+1)=37, 42+(4+1)(2*4+1)=61, etc.
Stepping to the next sequence, what becomes clearer is X3+((X+1)(X2+(X+1)(2*X+1)). This gives us:
03+(0+1)(02+(0+1)(2*0+1))=1, 13+(1+1)(12+(1+1)(2*1+1))=15, 23+(2+1)(22+(2+1)(2*2+1))=65, 33+(3+1)(32+(3+1)(2*3+1))=175, etc.
Extrapolating to the 5th power: X4+(X+1)((X3+(X+1)((X2+(X+1)(2*X+1))) yields:
04+(0+1)(03+(0+1)((02+(0+1)(2*0+1)))=1, 14+(1+1)(13+(1+1)((12+(x1+1)(2*1+1))=31, 24+(2+1)(23+(2+1)((22+(2+1)(2*2+1)))=211, 34+(3+1)(33+(3+1)((32+(3+1)(2*3+1)))=671, etc.
And for this example, taking it finally to the 6th power: X5+(X+1)((X4+(X+1)((X3+(X+1)((X2+(X+1)(2*X+1))))
05+(0+1)(04+(0+1)(03+(0+1)(02+(0+1)(2*0+1))))=1, 15+(1+1)(14+(1+1)(13+(1+1)(12+(1+1)(2*1+1))))=63, 25+(2+1)(24+(2+1)(23+(2+1)(X2+(2+1)(2*2+1))))=665, 35+(3+1)(34+(3+1)(33+(3+1)(32+(3+1)(2*3+1))))=3367, etc.
Could Fermat have induced from a pattern such as this, that for a power greater than 2, An+Bn=Cn could not have been resolved into an integral relationship?
fixed 761 from 671 on the 5th power 34,, & parenthesis fixed on various others.