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 A047076 a(n+1) is the smallest palindromic prime containing exactly 2 more digits on each end than the previous term, with a(n) as a central substring. 6
 2, 30203, 133020331, 1713302033171, 12171330203317121, 151217133020331712151, 1815121713302033171215181, 16181512171330203317121518161, 331618151217133020331712151816133, 9333161815121713302033171215181613339, 11933316181512171330203317121518161333911 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 REFERENCES Pickover, Clifford A., A Passion for Mathematics: Numbers, Puzzles, Madness, Religion and the Quest for Reality, John Wiley & Sons, Inc., Hoboken, New Jersey (2005) p. 108. LINKS C. K. Caldwell, Palindromic Primes MATHEMATICA cc=If[EvenQ[First[#]], Reverse[#], #]&/@Tuples[{Range[0, 9], Range[1, 9, 2]}]; nxt[n_]:=First[Select[Sort[FromDigits[Flatten[Join[{#, IntegerDigits[ n], Reverse[#]}]]]&/@cc], PrimeQ]]; NestList[nxt, 2, 10] (* Harvey P. Dale, Dec 24 2012 *) CROSSREFS Cf. A053600. Sequence in context: A247790 A233460 A324164 * A176721 A030462 A228556 Adjacent sequences:  A047073 A047074 A047075 * A047077 A047078 A047079 KEYWORD base,fini,full,nice,nonn AUTHOR G. L. Honaker, Jr., Jan 26 2000 STATUS approved

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Last modified April 23 05:55 EDT 2021. Contains 343199 sequences. (Running on oeis4.)