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A020658 Sequence contains no 7-term arithmetic progression. 1
1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 22, 23, 24, 25, 26, 27, 29, 30, 31, 32, 33, 34, 36, 37, 38, 39, 40, 41, 50, 51, 52, 53, 54, 55, 57, 58, 59, 60, 61, 62, 64, 65, 66, 67, 68, 69, 71, 72, 73, 74, 75, 76, 78, 79, 80, 81, 82, 83, 85, 86, 87, 88, 89, 90, 99 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

COMMENTS

This is different from A047304.

CROSSREFS

Sequence in context: A187396 A020659 A047304 * A195178 A043092 A023801

Adjacent sequences:  A020655 A020656 A020657 * A020659 A020660 A020661

KEYWORD

nonn

AUTHOR

David W. Wilson (davidwwilson(AT)comcast.net)

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Last modified February 15 03:59 EST 2012. Contains 205694 sequences.