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A016114 Circular primes (numbers which remain prime under cyclic shifts of digits). 4
2, 3, 5, 7, 11, 13, 17, 37, 79, 113, 197, 199, 337, 1193, 3779, 11939, 19937, 193939, 199933, 1111111111111111111, 11111111111111111111111 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The next repunit that is prime has 317 digits, all ones.  See A004023. [From Harvey P. Dale, Mar 22 2012]

LINKS

Table of n, a(n) for n=1..21.

K. S. Brown, On General Palindromic Numbers

C. K. Caldwell, Circular Primes

P. De Geest, Circular Primes

H. Heinz, Prime Patterns (Illustration using 19937)

MATHEMATICA

fQ[p_] := Module[{b = IntegerDigits[p], ps}, ps = Table[FromDigits[b = RotateLeft[b]], {Length[b]}]; If[p > Min[ps], False, And @@ PrimeQ[ps]]]; Select[Prime[Range[100000]], fQ] (* T. D. Noe, Mar 22 2012 *)

CROSSREFS

Sequence includes all prime repunits (A004023). Cf. A003459.

For a sequence listing all the prime-yielding cyclic permutations see A068652.

Sequence in context: A117835 A120639 A141263 * A053434 A241716 A061166

Adjacent sequences:  A016111 A016112 A016113 * A016115 A016116 A016117

KEYWORD

nonn,nice,base,more

AUTHOR

Robert G. Wilson v

EXTENSIONS

One more term from Lekraj Beedassy, Nov 07 2002

STATUS

approved

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Last modified October 22 19:09 EDT 2014. Contains 248400 sequences.