The term harmonic progression is identified in base64 scheme by the sequence aGFybW9uaWMgcHJvZ3Jlc3Npb24=, while the MD5 signature is equal to 2cf3aaa918449834c38b59d282ca6461. The ASCII encoding of harmonic progression in hexadecimal notation is 6861726d6f6e69632070726f6772657373696f6e.