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 A092249 Positions of the integers in the standard diagonal enumeration of the rationals (with the integers in the first column and diagonals moving up to the right). 0
 1, 2, 4, 6, 10, 12, 18, 22, 28, 32, 42, 46, 58, 64, 72, 80, 96, 102, 120, 128, 140, 150, 172, 180, 200, 212, 230, 242, 270, 278, 308, 324, 344, 360, 384, 396, 432, 450, 474, 490, 530, 542, 584, 604, 628, 650, 696, 712, 754, 774, 806, 830, 882, 900, 940, 964 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS A002088 without the leading zero. [R. J. Mathar, Jul 20 2009] LINKS EXAMPLE The first few terms of the full enumeration are 1, 2, 1/2, 3, 1/3, 4, 3/2, 2/3, 1/4, 5, giving a(n) = 1, 2, 4, 6, 10,... Contribution from R. J. Mathar, Jul 20 2009: (Start) The positions in the first column of the table ....1..1/2..1/3..1/4..1/5..1/6..1/7..1/8..1/9.1/10.1/11.1/12 ....2.......2/3.......2/5.......2/7.......2/9......2/11..... ....3..3/2.......3/4..3/5.......3/7..3/8......3/10.3/11..... ....4.......4/3.......4/5.......4/7.......4/9......4/11..... ....5..5/2..5/3..5/4.......5/6..5/7..5/8..5/9......5/11.5/12 ....6.................6/5.......6/7................6/11..... ....7..7/2..7/3..7/4..7/5..7/6.......7/8..7/9.7/10.7/11.7/12 ....8.......8/3.......8/5.......8/7.......8/9......8/11..... ....9..9/2.......9/4..9/5.......9/7..9/8......9/10.9/11..... ...10......10/3................10/7......10/9.....10/11..... ...11.11/2.11/3.11/4.11/5.11/6.11/7.11/8.11/911/10.....11/12 ...12................12/5......12/7...............12/11..... if scanned along rising antidiagonals, as defined by the ratios A038566(i)/A020653(i). (End) CROSSREFS Cf. A002088, A020653, A038566. Sequence in context: A152919 A306564 A002088 * A019332 A002491 A045958 Adjacent sequences:  A092246 A092247 A092248 * A092250 A092251 A092252 KEYWORD nonn AUTHOR Andrew Niedermaier, Feb 20 2004 EXTENSIONS a(11) and a(12) corrected by R. J. Mathar, Jul 20 2009 Incorrect recurrence formula removed by R. J. Mathar, Jul 29 2009 More terms (using A002088) from Michel Marcus, Sep 10 2018 STATUS approved

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Last modified May 26 14:39 EDT 2020. Contains 334626 sequences. (Running on oeis4.)