A234912 Primes which become palindromic primes when the digits are rotated once to the left.

2, 3, 5, 7, 11, 101, 113, 331, 337, 991, 1013, 1019, 3037, 7079, 9091, 11131, 11383, 11393, 11939, 33151, 33353, 33757, 70079, 77191, 77323, 77747, 77797, 77969, 77999, 99787, 100019, 101141, 101333, 101383, 101747, 101797, 101939, 101999, 303151, 303727

Offset

1,1

Links

Chai Wah Wu, Table of n, a(n) for n = 1..10000

Example

The prime 113 is in the sequence because 131 is a palindromic prime.

Prog

(PARI) rotl(a) = my(b, c, d); b=#Str(a); c=floor(a/(10^(b-1))); d=a-c*(10^(b-1)); 10*d+c
revint(n) = my(m=n%10); n\=10; while(n>0, m=m*10+n%10; n\=10); m
s=[]; forprime(n=2, 1000000, r=rotl(n); if(isprime(r) && revint(r)==r, s=concat(s, n))); s

Crossrefs

Cf. A235000.

Sequence in context: A083393 A182051 A052480 * A083137 A180440 A077652

Adjacent sequences: A234909 A234910 A234911 * A234913 A234914 A234915

Keyword

nonn,base

Author

Colin Barker, Jan 02 2014

Status

approved