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A113465
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Rectangular array read by antidiagonals: a(n, d) is the smallest number that starts an arithmetic progression with common difference d of n numbers with the same number of divisors.
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3
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1, 2, 1, 33, 3, 1, 242, 3, 2, 1, 11605, 213, 119, 3, 1, 28374, 213, 3445, 3, 2, 1, 171893, 1383, 15026, 111, 77, 5, 1, 1043710445721, 3091, 74783, 201, 8718, 5, 8, 1
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| First two columns are A006558 and A113466. First four rows are A000012, A065559, A113467 and A113468. a(9, 1) is unknown; the rest of the 9th antidiagonal is 8129,88015,201,8718,5,8,3,1.
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EXAMPLE
| a(4, 3) = 3445 because 3445, 3448, 3451 and 3454 each
have 8 divisors.
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CROSSREFS
| Cf. A006558, A065559, A113456, A113466, A113467, A113468.
Sequence in context: A054235 A016547 A081541 * A113456 A205445 A127608
Adjacent sequences: A113462 A113463 A113464 * A113466 A113467 A113468
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KEYWORD
| nonn,tabl,less
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AUTHOR
| David Wasserman (dwasserm(AT)earthlink.net), Jan 08 2006
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