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 A181882 The sums of pairs of adjacent terms are the odd palindromic primes in ascending order. 3
 2, 1, 4, 3, 8, 93, 38, 113, 68, 123, 190, 163, 210, 173, 554, 203, 584, 213, 706, 223, 10078, 423, 10178, 1133, 10278, 2143, 10578, 2243, 11088, 2743, 11188, 3153, 11588, 3863, 11688, 4373, 11988, 4573, 12088, 5383, 12588, 5593 (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 Table of n, a(n) for n=1..42. V. J. Pohjola, a(n)+a(n+1) = palindromic prime, Posting to the Sequence Fans Mailing List, Nov 11 2010. MATHEMATICA lst = {}; a = 2; c = 0; 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] = 2; 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, A181883, A181884. Sequence in context: A262230 A262155 A355166 * A109195 A258310 A217927 Adjacent sequences: A181879 A181880 A181881 * A181883 A181884 A181885 KEYWORD nonn,easy,base AUTHOR N. J. A. Sloane, Nov 18 2010 EXTENSIONS More terms from Nathaniel Johnston, Nov 22 2010 STATUS approved

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Last modified November 28 19:28 EST 2023. Contains 367419 sequences. (Running on oeis4.)