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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A231433 The digits of a(n) and a(n+1) taken together are the digits of a prime; least permutation of the nonnegative integers with this property. 5
 0, 11, 2, 3, 1, 4, 7, 6, 10, 9, 5, 12, 8, 18, 13, 15, 14, 17, 20, 23, 21, 16, 19, 22, 30, 25, 27, 26, 29, 24, 31, 28, 33, 32, 35, 36, 34, 37, 39, 38, 41, 42, 43, 45, 47, 44, 51, 40, 49, 46, 57, 50, 53, 48, 59, 56, 63, 52, 61, 54, 67, 55, 69, 58, 70, 60, 71, 62, 72 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS The offset is zero to have a permutation. Sequence A128280 is an "arithmetic" analog, where instead of concatenation of digits, the terms are added. Sequences A228407 and A228410 are the variants where "prime" is replaced by "palindrome". LINKS Lars Blomberg, Table of n, a(n) for n = 0..9999 E. Angelini, Two make a prime, Nov 09 2013 EXAMPLE Start with a(0)=0. The least prime having this digit is 101, so a(1)=11. Since 0 cannot be used any more and 111 is not a prime, the least digit that can added to get the digits of some prime (namely 211) is a(2)=2, then a(3)=3 yields 23, etc. See also the link to Angelini's post. PROG (PARI) {a=u=0; for(n=1, 99, u+=1<"0"&&(a=k)&&next(3))))} CROSSREFS Sequence in context: A099268 A070277 A109864 * A240454 A099756 A088277 Adjacent sequences: A231430 A231431 A231432 * A231434 A231435 A231436 KEYWORD nonn,base AUTHOR Eric Angelini and M. F. Hasler, Nov 09 2013 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 March 29 09:20 EDT 2023. Contains 361598 sequences. (Running on oeis4.)