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 A101783 Lower bound twin primes such that their digital reverse is prime and a lower bound twin prime. 1
 3, 5, 11, 17, 71, 101, 191, 1031, 1301, 7349, 7457, 7547, 7589, 9437, 9857, 10007, 10067, 10301, 10457, 10859, 11057, 11717, 11777, 11939, 12107, 12821, 13931, 14081, 14549, 14591, 16061, 16361, 16829, 17417, 18041, 19541, 19697, 19991 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..2500 EXAMPLE 17 is a lower bound twin prime and the reverse,71, is prime and also a lower bound twin prime. MATHEMATICA lbtpQ[n_]:=Module[{rp=FromDigits[Reverse[IntegerDigits[n]]]}, PrimeQ[rp] &&PrimeQ[rp+2]]; Select[Transpose[Select[Partition[Prime[Range[2300]], 2, 1], Last[#]-First[#]==2&]][[1]], lbtpQ] (* Harvey P. Dale, Jan 27 2012 *) PROG (PARI) twlrpr2(n) = { for(x=1, n, y=twinl(x); z=eval(rev(y)); if(isprime(z) && isprime(z+2), print1(y", ")) ) } twinl(n) = \The n-th upper twin prime { local(c, x); c=0; x=1; while(c

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Last modified September 26 14:24 EDT 2023. Contains 365660 sequences. (Running on oeis4.)