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A217591 Absolute differences between emirps (A006567) and their reversals. 0

%I #12 Oct 15 2012 14:01:36

%S 18,54,18,36,54,72,36,18,594,198,342,594,594,792,792,198,396,396,594,

%T 594,594,198,396,198,396,594,594,198,198,198,792,594,198,792,594,792,

%U 7992,180,270,2268,540,8532,810,6804,1908,7902,360

%N Absolute differences between emirps (A006567) and their reversals.

%C This is unsorted, and in order of appearance of emirps.

%C All values are multiples of 18 (A008600). - _Charles R Greathouse IV_, Oct 15 2012

%F a(n) = | A006567(n) - R(A006567(n)) | = | A006567(n) - A004086(A006567(n)) |.

%e a(1) = absolute value of first emirp versus its reversal = |13 - 31| = |-18| = 18.

%e a(2) = |17 - 71| = |-54| = 54.

%e a(3) = |31 - 13| = |18| = 18.

%e a(4) = |37 - 73| = |-36| = 36.

%Y Cf. A004086, A006567, A217286, A217386, A217387.

%K nonn,base,easy

%O 1,1

%A _Jonathan Vos Post_, Oct 07 2012

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Last modified April 24 13:00 EDT 2024. Contains 371945 sequences. (Running on oeis4.)