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A128150
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Least k such that n^k mod k = (n-1)^2, or 0 if no such k exists.
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23
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0, 41459, 35, 9569200211, 2673413, 10596486211, 1885511821439, 235, 12722173, 1971782729, 133617287, 14873, 1465, 1606870609, 4247, 129015968122421, 526673, 835, 1079115301, 12148589879, 12351683, 36947690849, 6385, 5809
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OFFSET
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2,2
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LINKS
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EXAMPLE
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a(8) = A119714(7^2) = 1885511821439,
a(17) = A128157(256) = 129015968122421,
a(21) = A128361(400) = 12148589879,
a(23) = A128363(484) = 36947690849,
a(30) = A128370(841) = 13633321649263,
a(32) = A128372(961) = 725521, etc.
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CROSSREFS
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Cf. A128148, A128149, A128172, A036236, A078457, A119678, A119679, A127816, A119715, A119714, A127817, A127818, A127819, A127820, A127821, A128154, A128155, A128156, A128157, A128158, A128159, A128160, A128361, A128362, A128363, A128364, A128365, A128366, A128367, A128368, A128369, A128370, A128371, A128372.
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KEYWORD
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hard,nonn
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AUTHOR
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EXTENSIONS
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a(13), a(14), a(16), a(18), a(19), a(24), a(25), a(27), a(29), a(32) from Alexander Adamchuk, Feb 17 2008
Corrected A-number in cross-reference. Copied a(8) to a(16) from other sequences. - R. J. Mathar, Aug 08 2009
a(17) from Joe Crump (joecr(AT)carolina.rr.com), Sep 17 2009.
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STATUS
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approved
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