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The 17 pure prime dates of each leap year of the form concatenate(month,day) with month and day also prime numbers.
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%I #8 Oct 18 2019 04:12:29

%S 23,211,223,229,37,311,313,317,331,53,523,73,719,113,1117,1123,1129

%N The 17 pure prime dates of each leap year of the form concatenate(month,day) with month and day also prime numbers.

%C For the non-leap case see A327918.

%C The months m = 2, 3, 5, 7, 11 contribute 4, 5, 2, 2, 4 days, respectively, adding to 17.

%Y Cf. A165243 (first four terms), A165292 (first five terms), A165555 (first two terms), A167187 (first two terms), A327349 (m and d nonprime allowed), A327915 (with 0 before d = 1..9), A327918 (non-leap year case), A327920 (pure prime dates of d.m form).

%K nonn,easy,fini,full

%O 1,1

%A _Wolfdieter Lang_, Oct 08 2019