This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A181884 The sums of pairs of adjacent terms are the odd palindromic primes in ascending order. 4
 3, 0, 5, 2, 9, 92, 39, 112, 69, 122, 191, 162, 211, 172, 555, 202, 585, 212, 707, 222, 10079, 422, 10179, 1132, 10279, 2142, 10579, 2242, 11089, 2742, 11189, 3152, 11589, 3862, 11689, 4372, 11989, 4572, 12089, 5382, 12589, 5592, 12889 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS This sequence was originally presented at http://www.sanaristikot.net by V.J. Pohjola, Nov 11 2010. [Added by V.J. Pohjola, Nov 25 2010.] There are four possible solutions: see A181881-A181884. LINKS V. J. Pohjola, a(n)+a(n+1) = palindromic prime, Posting to the Sequence Fans Mailing List, Nov 11 2010. MATHEMATICA lst = {}; a = 3; c = -1; Label[alku1]; b = c; Label[alku2]; b =b + 1; If[PrimeQ[a + b] && IntegerDigits[a + b] == Reverse[IntegerDigits[a + b]], AppendTo[lst, a], Goto[alku2]]; c = a; a = b; If[a < nn, Goto[alku1]]; lst  (* V.J. Pohjola, Nov 25 2010 *) a[1] = 3; pp = Select[Prime[Range[3000]], PalindromeQ]; lp = Length[pp]-1; aa = Table[a[n] + a[n+1], {n, lp}]; Array[a, lp] /. Solve[Thread[aa == Rest[pp]]][[1]] (* Jean-François Alcover, Feb 17 2018 *) CROSSREFS Cf. A002385, A181881, A181882, A181883. Sequence in context: A193067 A177886 A011293 * A284662 A292031 A201565 Adjacent sequences:  A181881 A181882 A181883 * A181885 A181886 A181887 KEYWORD nonn,easy,base AUTHOR N. J. A. Sloane, Nov 18 2010 EXTENSIONS More terms from Nathaniel Johnston, Nov 22 2010 Last term corrected by Jean-François Alcover, Feb 17 2018 STATUS approved

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

Last modified March 20 15:26 EDT 2018. Contains 300986 sequences. (Running on oeis4.)