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Search: id:A139609
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| A139609 |
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9th transversal numbers (or 9-transversal numbers): (A000217(9)-9)*n + 9. |
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+0
17
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| 9, 45, 81, 117, 153, 189, 225, 261, 297, 333, 369, 405, 441, 477, 513, 549, 585, 621, 657, 693, 729, 765, 801, 837, 873, 909, 945, 981, 1017, 1053, 1089, 1125, 1161, 1197, 1233, 1269, 1305, 1341, 1377, 1413, 1449, 1485, 1521, 1557
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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Numbers of the 9th column of positive numbers in the square array of nonnegative and polygonal numbers A139600. Also, numbers of the 9th column in the square array A057145.
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FORMULA
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a(n) = (A000217(9)-9)*n + 9 = (45-9)n + 9 = 36n + 9 = 9(4n + 1).
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CROSSREFS
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Cf. A001477, A000217, A000290, A000326, A000384, A000566, A000567, A001106, A001107, A051682, A051624, A051865, A051866, A051867, A051868, A051869, A051870, A000007, A000012, A000027, A008585, A016957, A017329, A139606, A139607, A139608, A139610, A139611, A139612, A139613, A139614, A139615, A139616, A057145, A086271, A139600, A139601, A016813.
Sequence in context: A053816 A044492 A067536 this_sequence A068314 A152996 A060008
Adjacent sequences: A139606 A139607 A139608 this_sequence A139610 A139611 A139612
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KEYWORD
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easy,nonn
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), Apr 27 2008
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