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 A201734 Numbers n such that 90*n + 47 is prime. 19
 0, 1, 2, 3, 6, 7, 9, 10, 13, 14, 16, 18, 20, 22, 24, 25, 27, 29, 31, 32, 38, 39, 43, 44, 49, 50, 51, 53, 56, 63, 64, 65, 66, 69, 77, 80, 83, 84, 87, 90, 91, 95, 98, 101, 102, 105, 106, 107, 108, 109, 111, 116, 118, 120, 121, 122, 123, 129, 132, 134, 135, 137 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS A reverse reading of A142313; all entries of A142313 have digital root 2 and last digit 7. LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..10000 FORMULA a(n) = (A142313(n)-47)/90. MAPLE for n from 0 to 240 do p := 90*n+47 ; if isprime(p) then printf("%d, ", n) ; end if; end do: # R. J. Mathar, Dec 05 2011 MATHEMATICA Select[Range[0, 400], PrimeQ[90 #+47]&] (* Vincenzo Librandi, Dec 11 2011 *) PROG (Magma) [n: n in [0..200] | IsPrime(90*n+47)]; // Vincenzo Librandi, Dec 11 2011 (PARI) is(n)=isprime(90*n+47) \\ Charles R Greathouse IV, Feb 17 2017 CROSSREFS Cf. A181732, A198382, A195993, A196000, A196007. Sequence in context: A047285 A191215 A190847 * A287775 A283208 A259726 Adjacent sequences: A201731 A201732 A201733 * A201735 A201736 A201737 KEYWORD nonn,easy,less AUTHOR J. W. Helkenberg, Dec 04 2011 STATUS approved

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Last modified August 13 01:30 EDT 2024. Contains 375113 sequences. (Running on oeis4.)