An experiment in rewarding mathematical progress.
Anyone can send funds to the contracts, and when solutions are found, the contract pays out the prize to the first successful entry.
(UPDATE: 33 IS SOLVED as of March 2019)
Best explained by numberphile (completely unaffiliated with me, this project or bigprimes.net): https://www.youtube.com/watch?v=wymmCdLdPvM
Very simply, the formula 33 = a³+b³+c³ has no known solutions. If you find one, sending the correct a, b and c values to the "33" ethereum contract (address to be added here soon) will pay out the value of the contract to you.
Deployed to rinkeby testnet (DO NOT SEND FUNDS HERE): https://rinkeby.etherscan.io/address/0x31ef141291f4836085253d6b42d04a403d7d2689#code (a³+b³+c³ = 29)
Deployed to mainnet:
https://etherscan.io/address/0x44ed4ab6eb434d3294625f10c6fc78ba706153a3#code (a³+b³+c³= 33)
Coming soon