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A180550 Primes that become a different prime under the mapping 4 <=> 9. 0
47, 97, 347, 397, 467, 491, 641, 691, 941, 967, 1433, 1447, 1451, 1487, 1933, 1951, 1987, 1997, 2243, 2293, 2417, 2543, 2593, 2741, 2791, 2917, 3407, 3467, 3907, 3967, 4001, 4007, 4013, 4091, 4093, 4127, 4133, 4157, 4243, 4283, 4337, 4391, 4423, 4597 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..44.

Index to Primes, Primes that become a different prime under some mapping.

MATHEMATICA

fQ[n_] := Block[{id = IntegerDigits@n}, (MemberQ[id, 4] || MemberQ[id, 9]) && PrimeQ[ FromDigits[ id /. {4 -> 9, 9 -> 4}] ]]; Select[ Prime@ Range@ 650, fQ]

CROSSREFS

Cf. A171053, A175791, A180517 thru A180559, A175789, A180560, A180561.

Sequence in context: A141944 A281437 A319051 * A176134 A155844 A245688

Adjacent sequences:  A180547 A180548 A180549 * A180551 A180552 A180553

KEYWORD

base,nonn

AUTHOR

Zak Seidov and Robert G. Wilson v, Sep 09 2010

STATUS

approved

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Last modified April 6 12:19 EDT 2020. Contains 333273 sequences. (Running on oeis4.)