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A084991 Palindromes which can be written as a sum of two prime numbers. 0

%I #3 Nov 24 2017 16:23:34

%S 4,5,6,7,8,9,22,33,44,55,66,88,99,111,141,151,181,202,212,222,232,242,

%T 252,262,272,282,292,313,333,404,414,424,434,444,454,464,474,484,494,

%U 505,525,565,595,606,616,626,636,646,656,666,676,686,696,808,818,828,838,848,858,868,878,888,898,909,939,949,969,979,999

%N Palindromes which can be written as a sum of two prime numbers.

%e E.g. 181 is a palindrome and is 179 + 2. 179 and 2 are both prime.

%t With[{upto=1000},Select[Select[Union[Total/@Tuples[Prime[ Range[ upto]],2]],# == IntegerReverse[#]&],#<=upto&]] (* _Harvey P. Dale_, Nov 24 2017 *)

%Y Cf. A014091.

%K nonn,base

%O 1,1

%A Meenakshi Srikanth (menakan_s(AT)yahoo.com), Jun 27 2003

%E More terms from _Harvey P. Dale_, Nov 24 2017

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Last modified May 22 23:49 EDT 2024. Contains 372758 sequences. (Running on oeis4.)