05AB1E, 5 bytes, sum 256 (05AB1E Code Page)

ΔTnon 

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This outputs: 1606938044258990275541962092341162602522202993782792835301376

Which, using 05AB1E's code-page results in: [1, 6, 0, 6, 9, 3, 8, 0, 4, 4, 2, 5, 8, 9, 9, 0, 2, 7, 5, 5, 4, 1, 9, 6, 2, 0, 9, 2, 3, 4, 1, 1, 6, 2, 6, 0, 2, 5, 2, 2, 2, 0, 2, 9, 9, 3, 7, 8, 2, 7, 9, 2, 8, 3, 5, 3, 0, 1, 3, 7, 6]

Which is: 256

Where the code is: ΔTnon

With code-points: [79, 29, 49, 50, 49]

Which is: 256

05AB1E, 5 bytes, sum 256 (05AB1E Base-255 Translation)

ΔTnon 

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This outputs: 1606938044258990275541962092341162602522202993782792835301376

Which, using 05AB1E's code-page results in: [1, 6, 0, 6, 9, 3, 8, 0, 4, 4, 2, 5, 8, 9, 9, 0, 2, 7, 5, 5, 4, 1, 9, 6, 2, 0, 9, 2, 3, 4, 1, 1, 6, 2, 6, 0, 2, 5, 2, 2, 2, 0, 2, 9, 9, 3, 7, 8, 2, 7, 9, 2, 8, 3, 5, 3, 0, 1, 3, 7, 6]

Which is: 256

Where the code is: ΔTnon

With code-points: [79, 29, 49, 50, 49]

Which is: 256

05AB1E, 3 bytes

Y8o 

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[Y=89, 8=56, o=111] = 256 = (1*2^8) 

Old versions:

05AB1E, 4 bytes

VTxn 

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[V=86, T=84, x=120, n=110] = 400 = (1*10*2)^2 

05AB1E, 5 bytes, sum 256 (05AB1E Code Page)

ΔTnon 

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This outputs: 1606938044258990275541962092341162602522202993782792835301376

Which, using 05AB1E's code-page results in: [1, 6, 0, 6, 9, 3, 8, 0, 4, 4, 2, 5, 8, 9, 9, 0, 2, 7, 5, 5, 4, 1, 9, 6, 2, 0, 9, 2, 3, 4, 1, 1, 6, 2, 6, 0, 2, 5, 2, 2, 2, 0, 2, 9, 9, 3, 7, 8, 2, 7, 9, 2, 8, 3, 5, 3, 0, 1, 3, 7, 6]

Which is: 256

Where the code is: ΔTnon

With code-points: [79, 29, 49, 50, 49]

Which is: 256