A171045 In the sequence of prime numbers, replace all the '8' digits with '4' and vice versa.

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 81, 83, 87, 53, 59, 61, 67, 71, 73, 79, 43, 49, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 189, 151, 157, 163, 167, 173, 179, 141, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 281, 251, 257, 263

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Mathematica

FromDigits[IntegerDigits[#] /. {8 -> p, 4 -> q} /. {p -> 4, q -> 8}] & /@ Prime[Range[100]] (* Harvey P. Dale, Jun 10 2011 *)

Prog

(PARI) a(n)=my(v=[0, 1, 2, 3, 8, 5, 6, 7, 4, 9]); subst(Pol(apply(k->v[k+1], digits(prime(n)))), 'x, 10) \\ Charles R Greathouse IV, Jul 31 2013

Crossrefs

Sequence in context: A012883 A296915 A171032 * A222566 A299171 A347977

Adjacent sequences: A171042 A171043 A171044 * A171046 A171047 A171048

Keyword

nonn,base,easy

Author

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

Status

approved