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Search: id:A097014
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| A097014 |
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Smallest x such that Mod[sigma[x],210]=n. |
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+0
5
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| 104, 1, 211, 2, 3, 8311689, 5, 4, 7, 3698, 399, 130321, 6, 9, 13, 8, 1477, 2458624, 10, 725904, 19, 676, 6751, 18766224, 14, 52707600, 489, 24649, 12, 220433409, 29, 16, 21, 1250, 2779, 3694084, 22, 5184, 37, 18, 27, 1382976, 20, 729, 43, 128, 217
(list; graph; listen)
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OFFSET
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0,1
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EXAMPLE
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Several numbers belonging to odd residues are either large squares or twice-squares.
Eg:r=n=209:a[209]=36324729=6027^2, sigma[6027^2]=210*172974+209.
Full set is easily available running through squares or twice squares.
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CROSSREFS
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Compare with A084303 and A097013.
Cf. A084301, A084303, A000203, A097011, A097012, A097014, A097015.
Sequence in context: A076460 A097726 A088584 this_sequence A106297 A090849 A091025
Adjacent sequences: A097011 A097012 A097013 this_sequence A097015 A097016 A097017
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KEYWORD
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fini,nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Aug 19 2004
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