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How can I repeat this operation on web3.js and get the same hash

function test(uint a, uint b) pure public returns (bytes32) {
    bytes32 hash = keccak256(abi.encodePacked(uint40(a), b);
    return hash;
}
  • a - last block number
  • b - is a large number like this: 58984214690415138970779328130626583025560028195120217299604246549340745742299

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