A171057 In the sequence of prime numbers, replace all the '9' digits with '8' and vice versa.

2, 3, 5, 7, 11, 13, 17, 18, 23, 28, 31, 37, 41, 43, 47, 53, 58, 61, 67, 71, 73, 78, 93, 98, 87, 101, 103, 107, 108, 113, 127, 131, 137, 138, 148, 151, 157, 163, 167, 173, 178, 191, 181, 183, 187, 188, 211, 223, 227, 228, 233, 238, 241, 251, 257, 263

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..10000

Mathematica

FromDigits[IntegerDigits[#] /. {9 -> p, 8 -> q} /. {p -> 8, q -> 9}] & /@ Prime[Range[60]] (* Vincenzo Librandi, Mar 01 2013, after Harvey P. Dale in similar sequences *)

Prog

(PARI) a(n)=my(v=[0, 1, 2, 3, 4, 5, 6, 7, 9, 8]); apply(k->v[k+1], digits(prime(n))) \\ Charles R Greathouse IV, Jul 16 2013
(Magma) [Seqint([d eq 9 select 8 else d eq 8 select 9 else d : d in Intseq(NthPrime(i))]) : i in [1..100] ]; // Vincenzo Librandi, Sep 17 2025

Crossrefs

Sequence in context: A100546 A359373 A117094 * A229786 A242122 A074721

Adjacent sequences: A171054 A171055 A171056 * A171058 A171059 A171060

Keyword

nonn,base,easy

Author

N. J. A. Sloane and Vincenzo Librandi, Sep 04 2010

Status

approved