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A226016 Primes with alternate digits even and odd, and most significant digit even. 0
2, 23, 29, 41, 43, 47, 61, 67, 83, 89, 2129, 2141, 2143, 2161, 2309, 2341, 2347, 2381, 2383, 2389, 2503, 2521, 2543, 2549, 2707, 2729, 2741, 2749, 2767, 2789, 2903, 2909, 2927, 2963, 2969, 4127, 4129, 4327, 4349, 4363, 4507, 4523, 4547, 4549, 4561, 4567, 4583 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The only difference compared to A068887 is that the 3 is missing here. - R. J. Mathar, May 26 2013

LINKS

Table of n, a(n) for n=1..47.

EXAMPLE

2143 is a member since its digits are alternatively even and odd.

MATHEMATICA

a[n_, k_]:=Union[Boole/@EvenQ[Take[IntegerDigits[n], {k, -1, 2}]]]; Join[{2}, Select[Prime[Range[5, 620]], {a[#, 1], a[#, 2]}=={{1}, {0}} &]]

CROSSREFS

Cf. A000040, A030144.

Sequence in context: A045391 A154758 A156614 * A235150 A114549 A235148

Adjacent sequences:  A226013 A226014 A226015 * A226017 A226018 A226019

KEYWORD

nonn,base

AUTHOR

Jayanta Basu, May 22 2013

STATUS

approved

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Last modified October 21 11:42 EDT 2019. Contains 328296 sequences. (Running on oeis4.)