Sixth Power as Sum of 7 Sixth Powers
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Theorem
The smallest known integer whose $6$th power can be expressed as the sum of $7$ smaller $6$th powers is $1141$:
- $1141^6 = 74^6 + 234^6 + 402^6 + 474^6 + 702^6 + 894^6 + 1077^6$
Proof
\(\ds \) | \(\) | \(\ds 74^6 + 234^6 + 402^6 + 474^6 + 702^6 + 894^6 + 1077^6\) | ||||||||||||
\(\ds \) | \(=\) | \(\ds 164 \, 206 \, 490 \, 176\) | ||||||||||||
\(\ds \) | \(\) | \(\, \ds + \, \) | \(\ds 164 \, 170 \, 508 \, 913 \, 216\) | |||||||||||
\(\ds \) | \(\) | \(\, \ds + \, \) | \(\ds 4 \, 220 \, 426 \, 278 \, 476 \, 864\) | |||||||||||
\(\ds \) | \(\) | \(\, \ds + \, \) | \(\ds 11 \, 341 \, 488 \, 324 \, 787 \, 776\) | |||||||||||
\(\ds \) | \(\) | \(\, \ds + \, \) | \(\ds 119 \, 680 \, 300 \, 997 \, 734 \, 464\) | |||||||||||
\(\ds \) | \(\) | \(\, \ds + \, \) | \(\ds 510 \, 534 \, 520 \, 424 \, 456 \, 256\) | |||||||||||
\(\ds \) | \(\) | \(\, \ds + \, \) | \(\ds 1 \, 560 \, 609 \, 404 \, 742 \, 322 \, 089\) | |||||||||||
\(\ds \) | \(=\) | \(\ds 2 \, 206 \, 550 \, 475 \, 483 \, 180 \, 841\) | ||||||||||||
\(\ds \) | \(=\) | \(\ds 1141^6\) |
$\blacksquare$
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $1141$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $1141$