A245063 Primes p such that (p reversed)-1 is not a prime.

2, 5, 7, 11, 13, 17, 19, 29, 31, 37, 43, 53, 59, 61, 67, 71, 73, 79, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 239, 241, 263, 269, 271, 277, 283, 293, 307, 311, 313, 317, 331

Offset

1,1

Comments

Complement of A167216.

Links

Andrew Howroyd, Table of n, a(n) for n = 1..1000

Mathematica

Select[Prime[Range[3700]], ! PrimeQ[FromDigits[Reverse[IntegerDigits[#]]] - 1] &]

Prog

(Magma) [p: p in PrimesInInterval(2, 400) |not IsPrime(q-1) where q is Seqint(Reverse(Intseq(p)))];
(PARI) ok(n)={isprime(n)&&!isprime(fromdigits(Vecrev(digits(n)))-1)} \\ Andrew Howroyd, Feb 27 2018

Crossrefs

Cf. A167216.

Sequence in context: A020619 A165439 A228200 * A168033 A331486 A257974

Adjacent sequences: A245060 A245061 A245062 * A245064 A245065 A245066

Keyword

nonn,base

Author

Vincenzo Librandi, Jul 11 2014

Status

approved