A227407 Prime numbers representing a date in "condensed European notation" DDMMYY.

10103, 10111, 10133, 10139, 10141, 10151, 10159, 10163, 10169, 10177, 10181, 10193, 10211, 10223, 10243, 10247, 10253, 10259, 10267, 10271, 10273, 10289, 10301, 10303, 10313, 10321, 10331, 10333, 10337, 10343, 10357, 10369, 10391, 10399, 10427, 10429, 10433

Offset

1,1

Comments

For February, the number of days will be 28 only, as the year cannot be a leap year if DDMMYY is to be a prime number.

The sequence is finite, with 3111 terms. The largest term is a(3111)=311299.

Links

Shyam Sunder Gupta, Table of n, a(n) for n = 1..3111

Example

a(1)=10103 is prime and represents a date in DDMMYY format as 010103.

Mathematica

t = {}; Do[If[m < 8, If[OddQ[m], b = 31, If[m == 2, b = 28, b = 30]], If[OddQ[m], b = 30, b = 31]]; Do[a = 100 m + y + 10000 d; If[PrimeQ[a], AppendTo[t, a]], {d, 1, b}], {m, 1, 12}, {y, 1, 99}]; Union[t]

Crossrefs

Cf. A213182, A227409.

Sequence in context: A353110 A144863 A300558 * A227409 A352947 A260247

Adjacent sequences: A227404 A227405 A227406 * A227408 A227409 A227410

Keyword

nonn,base,fini,full,less

Author

Shyam Sunder Gupta, Sep 22 2013

Status

approved