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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A211655 Down-sortable primes: Primes that are also primes after digits are sorted into decreasing order. 2
 2, 3, 5, 7, 11, 13, 17, 31, 37, 41, 43, 53, 61, 71, 73, 79, 83, 97, 113, 131, 149, 157, 163, 167, 179, 181, 191, 197, 199, 211, 241, 251, 281, 311, 313, 331, 337, 347, 359, 373, 389, 419, 421, 431, 433, 443, 461, 463, 491, 521, 541, 563, 571, 593, 613, 617, 631, 641, 643, 653 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS All 1- and 2-digit reversible primes (A007500) are trivially in this sequence. No primes from A056709 are in this sequence. Clearly all absolute primes (A003459) are sortable primes but not all sortable primes are absolute primes. - Alonso del Arte, Oct 08 2013 LINKS Francis J. McDonnell, Table of n, a(n) for n = 1..10000 Francis J. McDonnell, Java Program EXAMPLE 131 is prime and after sorting its digits into nonincreasing order we obtain 311, which is prime. 163 is in the sequence because its digits sorted in decreasing order give 631, which is prime. (Note that this is not a reversible prime, since 361 = 19^2.) MATHEMATICA Select[Prime[Range[200]], PrimeQ[FromDigits[-Sort[-IntegerDigits[#]]]] &] (* T. D. Noe, Apr 17 2012 *) CROSSREFS Cf. A004186, A211654, A028864, A028867. Sequence in context: A105909 A197187 A086498 * A359138 A061461 A359139 Adjacent sequences: A211652 A211653 A211654 * A211656 A211657 A211658 KEYWORD nonn,base,easy AUTHOR Francis J. McDonnell, Apr 17 2012 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 August 3 05:44 EDT 2024. Contains 374875 sequences. (Running on oeis4.)