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A053726
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"Flag numbers": number of dots that can be arranged in successive rows of K, K-1, K, K-1, K, ..., K-1, K (assuming there is a total of L > 1 rows of size K > 1).
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4
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5, 8, 11, 13, 14, 17, 18, 20, 23, 25, 26, 28, 29, 32, 33, 35, 38, 39, 41, 43, 44, 46, 47, 48, 50, 53, 56, 58, 59, 60, 61, 62, 63, 65, 67, 68, 71, 72, 73, 74, 77, 78, 80, 81, 83, 85, 86, 88, 89, 92, 93, 94, 95, 98, 101, 102, 103, 104, 105, 107, 108, 109, 110, 111, 113, 116
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| If K=1, L=1 were allowed, this would contain all positive integers.
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FORMULA
| Numbers of the form F(K, L) = KL+(K-1)(L-1), K, L > 1, i.e. 2KL - (K+L) + 1, sorted and duplicates removed.
Positive numbers > 1 but not of the form (odd primes plus one)/2. - Douglas Winston (douglas.winston(AT)srupc.com), Sep 11 2003
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CROSSREFS
| A008508(n) + n + 1.
Sequence in context: A189577 A047700 A104275 * A173977 A161537 A189724
Adjacent sequences: A053723 A053724 A053725 * A053727 A053728 A053729
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KEYWORD
| nonn,easy
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AUTHOR
| Dan Asimov, asimovd(AT)aol.com, Apr 09 2003
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EXTENSIONS
| More terms from Douglas Winston (douglas.winston(AT)srupc.com), Sep 11 2003
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