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A097644 Numbers n such that pi(n) = reversal(n). 0

%I #10 Mar 09 2023 17:26:38

%S 51,130,370,8201,73270,82080,26113610,4854248220,37682961610

%N Numbers n such that pi(n) = reversal(n).

%C This sequence has only two odd terms, i.e., 51 and 8201 and 10 divides all other terms. Next term is greater than 10^8.

%e 26113610 is in the sequence because

%e pi(26113610) = 1631162 = reversal(26113610).

%t Do[If[PrimePi[m]==FromDigits[Reverse[IntegerDigits[m]]], Print[m]], {m, 100000000}]

%Y Cf. A037171, A069215.

%K base,nonn

%O 1,1

%A _Farideh Firoozbakht_, Aug 25 2004

%E Two more terms from _Giovanni Resta_, Feb 06 2006

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Last modified April 24 19:24 EDT 2024. Contains 371962 sequences. (Running on oeis4.)