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7, 28, 49, 70, 91, 112, 133, 154, 175, 196, 217, 238, 259, 280, 301, 322, 343, 364, 385, 406, 427, 448, 469, 490, 511, 532, 553, 574, 595, 616, 637, 658, 679, 700, 721, 742, 763, 784, 805, 826, 847, 868, 889, 910, 931, 952, 973, 994
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| Numbers of the 7th column of positive numbers in the square array of nonnegative and polygonal numbers A139600. Also, numbers of the 7th column in the square array A057145.
7th transversal numbers (or 7-transversal numbers): (A000217(7)-7)*n + 7.
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 0..5000
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MATHEMATICA
| Range[7, 1500, 21] (* From Vladimir Joseph Stephan Orlovsky, June 01 2011 *)
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PROG
| (MAGMA) [21*n+7: n in [0..60]]; // Vincenzo Librandi, Jul 23 2011
(PARI) a(n)=21*n+7 \\ Charles R Greathouse IV, Oct 05 2011
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CROSSREFS
| Sequence in context: A155712 A015817 A103253 * A068206 A118120 A078307
Adjacent sequences: A139604 A139605 A139606 * A139608 A139609 A139610
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KEYWORD
| easy,nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Apr 27 2008
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