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Search: id:A002733
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| A002733 |
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Numbers n such that (n^2 + 1)/10 is prime.
(Formerly M4342 N1047)
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+0
1
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| 7, 13, 17, 23, 27, 33, 37, 53, 63, 67, 77, 87, 97, 103, 113, 127, 137, 147, 153, 163, 167, 197, 223, 227, 247, 263, 267, 277, 283, 287, 297, 303, 323, 347, 363, 367, 373, 383, 397
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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L. Euler, De numeris primis valde magnis (E283), reprinted in: Opera Omnia. Teubner, Leipzig, 1911, Series (1), Vol. 3, p. 25.
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MAPLE
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a := [ ]: for n from 1 to 400 do if (n^2+1 mod 10) = 0 and isprime((n^2+1)/10) then a := [ op(a), n ]; fi; od;
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CROSSREFS
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Adjacent sequences: A002730 A002731 A002732 this_sequence A002734 A002735 A002736
Sequence in context: A032669 A106084 A110053 this_sequence A108334 A136083 A089531
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KEYWORD
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nonn
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AUTHOR
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njas
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