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A152018
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Denominator of 1/n^2-1/(3n)^2 or of 8/(9n^2).
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1
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9, 9, 81, 18, 225, 81, 441, 72, 729, 225, 1089, 162, 1521, 441, 2025, 288, 2601, 729, 3249, 450, 3969, 1089, 4761, 648, 5625, 1521, 6561, 882, 7569, 2025, 8649, 1152, 9801, 2601, 11025, 1458, 12321, 3249, 13689, 1800, 15129, 3969, 16641, 2178, 18225
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| The associated terms of the n-th main series of the Hydrogen energy spectrum are A000290(3), A061038(6), A061040(9), A061042(12), A061044(15), A061046(18), A061048(21), A061050(24) etc.
All numbers are multiples of 9.
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MATHEMATICA
| Denominator/@(8/(9Range[50]^2)) (* From Harvey P. Dale, Mar 15 2011 *)
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CROSSREFS
| Cf. A143025 with a similar principle of construction.
Sequence in context: A145971 A183893 A165830 * A112296 A038299 A165427
Adjacent sequences: A152015 A152016 A152017 * A152019 A152020 A152021
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KEYWORD
| nonn
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AUTHOR
| Paul Curtz (bpcrtz(AT)free.fr), Nov 20 2008
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EXTENSIONS
| Stratified definition, corrected indices, extended, R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Dec 10 2008
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