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A261449 Prime numbers whose decimal digits contain a total of two loops. 0

%I #13 Aug 22 2015 06:03:27

%S 83,109,149,181,199,269,281,283,349,383,401,419,439,443,461,463,467,

%T 479,491,509,569,587,599,601,607,619,641,643,647,659,661,691,709,769,

%U 787,811,821,823,827,853,857,877,907,919,929,941,947,967,991,997,1019,1039

%N Prime numbers whose decimal digits contain a total of two loops.

%C Of the digits, 0 through 9, {0, 4, 6, 9} have one loop, 8 has two loops, and all the rest have none. - _Robert G. Wilson v_, Aug 20 2015

%e 83 is the first term of the sequence. The digit 8 contains two closed curves.

%t Select[Prime@ Range@ 200, 2 == Total[{ 1,0, 0,0, 1,0, 1,0, 2,1}[[1 + IntegerDigits@ #]]]&] (* _Giovanni Resta_, Aug 19 2015 *)

%Y Cf. A001729, A190222, A001743, A001744, A001745, A249572.

%K nonn,less,easy,base

%O 1,1

%A _Altug Alkan_, Aug 19 2015

%E More terms from _Giovanni Resta_, Aug 19 2015

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Last modified April 19 02:45 EDT 2024. Contains 371782 sequences. (Running on oeis4.)