The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A101471 Numbers n such that the number n11 is prime. 4
 0, 2, 3, 8, 9, 15, 18, 20, 21, 23, 24, 27, 30, 35, 39, 41, 42, 50, 57, 60, 62, 63, 69, 72, 74, 80, 81, 83, 90, 93, 95, 98, 101, 102, 107, 113, 114, 120, 122, 125, 126, 129, 134, 137, 140, 144, 155, 161, 164, 168, 170, 179, 182, 183, 189, 192, 200, 204, 206, 210, 212 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS n such that 100*n+11 is prime. - Robert Israel, Jul 30 2015 LINKS Robert Israel, Table of n, a(n) for n = 1..10000 Chris Caldwell, The first 1,000 primes. EXAMPLE If n=2, then n11 = 211 (prime); If n=50, then n11 = 5011 (prime); If n=98, then n11 = 9811 (prime). MAPLE select(t -> isprime(100*t+11), [\$0..1000]); # Robert Israel, Jul 30 2015 MATHEMATICA Select[ Range[0, 215], PrimeQ[ FromDigits[ Flatten[ IntegerDigits /@ { #, 1, 1}]]] &] (* Robert G. Wilson v, Feb 21 2005 *) Select[Range[0, 250], PrimeQ[100#+11]&] (* Harvey P. Dale, Oct 11 2018 *) PROG (Magma) [n: n in [0..250] | IsPrime(Seqint(Intseq(11) cat Intseq(n)))] /* or */ [n: n in [0..240] |IsPrime(100*n+11)]; // Vincenzo Librandi, Jul 31 2015 (PARI) is(n)=isprime(100*n+11) \\ Charles R Greathouse IV, Feb 20 2017 CROSSREFS Cf. A024912 (10n+1 is prime), A167442 (the actual primes 100n+11). Sequence in context: A029787 A246396 A054462 * A137471 A051209 A332481 Adjacent sequences: A101468 A101469 A101470 * A101472 A101473 A101474 KEYWORD nonn,base AUTHOR Parthasarathy Nambi, Jan 30 2005, Feb 18 2005 EXTENSIONS Corrected and extended by Robert G. Wilson v, Feb 21 2005 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified September 30 21:59 EDT 2023. Contains 365812 sequences. (Running on oeis4.)