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A156797
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Numbers k such that k^2 + 2 == 0 (mod (9^2)).
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2
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22, 59, 103, 140, 184, 221, 265, 302, 346, 383, 427, 464, 508, 545, 589, 626, 670, 707, 751, 788, 832, 869, 913, 950, 994, 1031, 1075, 1112, 1156, 1193, 1237, 1274, 1318, 1355, 1399, 1436, 1480, 1517, 1561, 1598, 1642, 1679, 1723, 1760, 1804, 1841, 1885
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Sum_{n>=1} (-1)^(n+1)/a(n) = tan(37*Pi/162)*Pi/81. - Amiram Eldar, Feb 26 2023
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MATHEMATICA
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Select[Range[2000], PowerMod[#, 2, 81]==79&] (* Harvey P. Dale, Jun 30 2011 *)
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PROG
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(Magma) I:=[22, 59, 103]; [n le 3 select I[n] else Self(n-1)+Self(n-2)-Self(n-3): n in [1..50]]; // Vincenzo Librandi, Feb 09 2012
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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