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A086887
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a(n)=least semiprime with factors not previously used containing integers 2n and 2n+1 as substrings.
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0
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1111, 6, 205, 427, 1577, 11639, 1651, 22499, 2771, 34571, 253411, 5129, 60491, 59701, 8149, 9517, 307793, 122491, 13579, 53237, 168019, 18103, 202451, 21667, 169963, 377753, 27613, 301337, 88391, 34633, 368413, 750523, 418573, 44287
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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EXAMPLE
| Sequence:....1111....6...205...427...1577....11639....1651..
Factors.:..101*11..2*3..41*5..61*7..83*19..103*113..127*13..
2n, 2n+1:.....0,1..2,3...4,5...6,7....8,9....10,11...12,13..
n ......:.......0....1.....2.....3......4........5.......6..
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CROSSREFS
| Sequence in context: A036105 A036103 A147589 * A100846 A176670 A072434
Adjacent sequences: A086884 A086885 A086886 * A086888 A086889 A086890
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KEYWORD
| base,easy,nonn
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AUTHOR
| Jason Earls (zevi_35711(AT)yahoo.com), Aug 22 2003
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EXTENSIONS
| More terms from Ray Chandler (rayjchandler(AT)sbcglobal.net), Aug 31 2003
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