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A121291
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Rounded partial sum of atomic weights of first n elements.
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1
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1, 5, 12, 21, 31, 43, 57, 73, 92, 112, 135, 160, 187, 215, 246, 278, 318, 353, 392, 432, 477, 525, 576, 628, 683, 739, 798, 857, 920, 986, 1055, 1128, 1203
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OFFSET
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1,2
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LINKS
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EXAMPLE
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a(1) = round(1.0080) = 1 = mean atomic weight of hydrogen (protium + deuterium + tritium).
a(2) = round (1.0080+4.003) = round(5.011) = 5 (heium 4 and rarer helium 3).
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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