A062335 Primes starting and ending with 9.
919, 929, 9029, 9049, 9059, 9109, 9199, 9209, 9239, 9319, 9349, 9419, 9439, 9479, 9539, 9619, 9629, 9649, 9679, 9689, 9719, 9739, 9749, 9769, 9829, 9839, 9859, 9929, 9949, 90019, 90059, 90089, 90149, 90199, 90239, 90289, 90359, 90379, 90439
Offset: 1
Examples
9679 is a member, as it is a prime and the first and the last digits are both 9.
Links
- Harry J. Smith, Table of n, a(n) for n = 1..1000
Programs
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Mathematica
fl9Q[n_]:=IntegerDigits[n][[1]]==IntegerDigits[n][[-1]]==9; Select[ Prime[ Range[10000]],fl9Q] (* Harvey P. Dale, Dec 31 2019 *)
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PARI
{ default(primelimit, 10^6); n=-1; t=log(10); forprime (p=2, 10^6, if ((p-10*(p\10)) == 9 && (p\10^(log(p)\t)) == 9, write("b062335.txt", n++, " ", p); if (n==1000, break)) ) } \\ Harry J. Smith, Aug 05 2009
Extensions
More terms from Larry Reeves (larryr(AT)acm.org), Jun 29 2001
Offset changed by Andrew Howroyd, Sep 17 2024