login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A068887 Primes with property that digits alternate in parity individually as well as in concatenation with previous terms. 1
2, 3, 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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..40.

MATHEMATICA

d[n_]:=IntegerDigits[n]; aQ[n_]:=Union[Abs[Differences[Boole@EvenQ[d[n]]]]]=={1}; t={2, 3}; Do[p=Prime[i]; x=FromDigits[Flatten[{d[Last[t]], d[p]}]]; If[aQ[p] && aQ[x], AppendTo[t, p]], {i, 5, 600}]; t (* Jayanta Basu, May 23 2013 *)

CROSSREFS

Cf. A030144.

Sequence in context: A042585 A143279 A272271 * A260128 A220569 A328940

Adjacent sequences:  A068884 A068885 A068886 * A068888 A068889 A068890

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Mar 20 2002

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 26 05:51 EST 2020. Contains 332277 sequences. (Running on oeis4.)