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 A101782 Upper bound of twin prime pairs whose digital reverse is prime. 0
 5, 7, 13, 31, 73, 151, 181, 199, 313, 1021, 1033, 1153, 1231, 1279, 1321, 1429, 1453, 1669, 1723, 1789, 1879, 1933, 3121, 3169, 3301, 3373, 3391, 3463, 3469, 3541, 3583, 3853, 7459, 7561, 7879, 7951, 9001, 9013, 9241, 9421, 9439, 9679, 9721, 9769, 9931 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS EXAMPLE 13 is the upper bound of twin prime pair (11,13) and its digital reverse, 31, is prime. PROG (PARI) twurpr(n) = { for(x=1, n, y=twinu(x); z=eval(rev(y)); if(isprime(z), print1(y", ")) ) } twinu(n) = \The n-th upper twin prime { local(c, x); c=0; x=1; while(c

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Last modified August 23 11:55 EDT 2019. Contains 326222 sequences. (Running on oeis4.)