

A196095


Prime numbers that cannot become prime by chopping off any of the initial consecutive digits.


3



11, 19, 29, 31, 41, 59, 61, 71, 79, 89, 101, 109, 139, 149, 151, 181, 191, 199, 239, 251, 269, 281, 349, 401, 409, 421, 439, 449, 491, 499, 509, 521, 569, 599, 601, 691, 701, 709, 739, 751, 769, 809, 821, 839, 881, 991, 1009, 1021, 1039, 1049, 1051, 1069
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OFFSET

1,1


LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000


EXAMPLE

139 qualifies because neither 9 nor 39 is prime


MATHEMATICA

Select[Prime[Range[200]], Union[PrimeQ[Table[Mod[#, 10^i], {i, Floor[Log[10, #]]}]]] == {False} &] (* T. D. Noe, Sep 27 2011 *)
cbpQ[n_]:=NoneTrue[Table[FromDigits[Drop[IntegerDigits[n], i]], {i, IntegerLength[ n]1}], PrimeQ]; Select[Prime[Range[5, 200]], cbpQ] (* The program uses the NoneTrue function from Mathematica version 10 *) (* Harvey P. Dale, Aug 27 2014 *)


CROSSREFS

Sequence in context: A057538 A123976 A045468 * A268271 A053032 A277123
Adjacent sequences: A196092 A196093 A196094 * A196096 A196097 A196098


KEYWORD

nonn,base


AUTHOR

J. Lowell, Sep 27 2011


EXTENSIONS

More terms from T. D. Noe, Sep 27 2011


STATUS

approved



