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A327918 The 16 pure prime dates of each non-leap year of the form concatenate(month,day) with month and day also prime numbers. 2
23, 211, 223, 37, 311, 313, 317, 331, 53, 523, 73, 719, 113, 1117, 1123, 1129 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

For the numbers for leap years see A327919.

Only the months February (2), March (3), May (5), July (7) and November (11) qualify. The qualifying prime days are for month m=2: 3, 5, 7, 11, 13, 17, 19, 23; for month m = 11: 3, 5, 7, 11, 13, 17, 19, 23, 29 and for months m = 3, 5, and 7: 3, 5, 7, 11, 13, 17, 19, 23, 29, 31.

The months m = 2, 3, 5, 7, 11 contribute 3, 5, 2, 2, 4 days, respectively, adding to 16.

LINKS

Table of n, a(n) for n=1..16.

CROSSREFS

Cf. A165243 (first three terms), A165292 (first five terms), A165555 (first two terms), A167187 (first two terms), A327348 (m and d nonprime allowed), A327914 (with 0 before d = 1..9), A327919 (leap year), A327920 (pure prime dates of d.m form).

Sequence in context: A263521 A084428 A322287 * A327919 A165243 A142374

Adjacent sequences:  A327915 A327916 A327917 * A327919 A327920 A327921

KEYWORD

nonn,easy,fini,full

AUTHOR

Wolfdieter Lang, Oct 08 2019

STATUS

approved

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Last modified December 11 23:44 EST 2019. Contains 329945 sequences. (Running on oeis4.)