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 A046472 Palindromic primes in base 10 and base 2. 0
 3, 5, 7, 313, 7284717174827, 390714505091666190505417093 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS P. De Geest, World!Of Palindromic Primes MATHEMATICA Select[Prime[Range[10!]], IntegerDigits[#]==Reverse[IntegerDigits[#]] && IntegerDigits[#, 2]==Reverse[IntegerDigits[#, 2]]&] (* Vladimir Joseph Stephan Orlovsky, Dec 30 2010 *) p = Sort[Reap[Do[d=IntegerDigits[n]; p1=FromDigits[Join[Most[d], Reverse[d]]]; p2=FromDigits[Join[d, Reverse[d]]]; If[IntegerDigits[p1, 2] == Reverse[IntegerDigits[p1, 2]], Sow[p1]]; If[IntegerDigits[p2, 2] == Reverse[IntegerDigits[p2, 2]], Sow[p2]], {n, 0, 9999999}]][[2, 1]]]; Select[p, PrimeQ] CROSSREFS Cf. A002385 (palindromic primes), A007632 (palindromes in bases 2 and 10). Sequence in context: A082756 A268693 A068832 * A065824 A191546 A069463 Adjacent sequences:  A046469 A046470 A046471 * A046473 A046474 A046475 KEYWORD nonn,hard,base AUTHOR Patrick De Geest, Aug 15 1998 EXTENSIONS a(6) (from A007632) added by T. D. Noe, Dec 31 2010 STATUS approved

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Last modified April 7 04:20 EDT 2020. Contains 333292 sequences. (Running on oeis4.)