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A180006 Composite numbers that can be obtained from primes by interchanging the first and last digits. 1

%I #5 Mar 30 2012 18:38:21

%S 91,32,92,14,34,74,35,95,16,76,38,98,301,901,721,731,931,361,371,391,

%T 791,112,322,722,922,332,932,142,152,752,362,962,172,772,182,382,392,

%U 703,713,133,943,763,973,793,104,904,914,124,134,334,934,344,944,754

%N Composite numbers that can be obtained from primes by interchanging the first and last digits.

%C The primes must contain at least two digits.

%e The composite number 752 is obtained from the prime 257 by interchanging the first and last digits.

%Y The corresponding primes are A076056. Cf. A002808, A179826.

%K nonn,base

%O 1,1

%A _Parthasarathy Nambi_, Aug 06 2010

%E More terms from _Vincenzo Librandi_, Aug 06 2010

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Last modified May 6 13:11 EDT 2024. Contains 372293 sequences. (Running on oeis4.)