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A020657
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"Earliest" sequence containing no 7-term arithmetic progression.
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2
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0, 1, 2, 3, 4, 5, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19, 21, 22, 23, 24, 25, 26, 28, 29, 30, 31, 32, 33, 35, 36, 37, 38, 39, 40, 49, 50, 51, 52, 53, 54, 56, 57, 58, 59, 60, 61, 63, 64, 65, 66, 67, 68, 70, 71, 72, 73, 74, 75, 77, 78, 79, 80, 81, 82, 84, 85
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| Also the set of numbers with no "6" in their base-7 representation; see comments for A020654. - Nathaniel Johnston, Jun 27 2011
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LINKS
| Nathaniel Johnston, Table of n, a(n) for n = 1..10000
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MAPLE
| seq(`if`(numboccur(6, convert(n, base, 7))=0, n, NULL), n=0..85); # Nathaniel Johnston, Jun 27 2011
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CROSSREFS
| Cf. A005836, A020654.
Sequence in context: A023055 A047368 A037470 * A187394 A057907 A109234
Adjacent sequences: A020654 A020655 A020656 * A020658 A020659 A020660
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KEYWORD
| nonn,easy
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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