A171022 -id:A171022 - cp's OEIS frontend

A180540 Primes that become a different prime under the mapping 3 <=> 4.

31, 37, 41, 47, 139, 149, 349, 367, 379, 439, 467, 479, 631, 641, 937, 947, 1039, 1049, 1327, 1381, 1399, 1427, 1481, 1499, 2131, 2141, 2311, 2347, 2377, 2411, 2437, 2477, 2539, 2549, 2731, 2741, 3001, 3019, 3079, 3217, 3229, 3259, 3271, 3331, 3449, 3457

Offset: 1

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

Robert Price, Table of n, a(n) for n = 1..1576
Index to Primes, Primes that become a different prime under some mapping.

Cf. A171022, A175791, A180517 thru A180559, A175789, A180560, A180561.

fQ[n_] := Block[{id = IntegerDigits@n}, (MemberQ[id, 3] || MemberQ[id, 4]) && PrimeQ[ FromDigits[ id /. {3 -> 4, 4 -> 3}] ]]; Select[ Prime@ Range@ 500, fQ]

A222234 In the number n, replace all (decimal) digits '3' with '4' and vice versa.

Original entry on oeis.org

0, 1, 2, 4, 3, 5, 6, 7, 8, 9, 10, 11, 12, 14, 13, 15, 16, 17, 18, 19, 20, 21, 22, 24, 23, 25, 26, 27, 28, 29, 40, 41, 42, 44, 43, 45, 46, 47, 48, 49, 30, 31, 32, 34, 33, 35, 36, 37, 38, 39, 50, 51, 52, 54, 53, 55, 56, 57, 58, 59, 60, 61, 62, 64, 63, 65, 66, 67, 68, 69, 70, 71, 72, 74, 73, 75

Offset: 0

M. F. Hasler, Feb 12 2013

The map which is applied to primes in A171022.

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

Cf. A222210-A222254; A171013-A171016, A175770, A171018-A171057.

a[n_]:= IntegerDigits[n]/.{3->4, 4->3} // FromDigits; Table[a[n], {n, 0, 80}] (* Vincenzo Librandi, Jul 30 2013 *)

A222234(n,d=[0,1,2,4,3,5,6,7,8,9])=sum(i=1,#n=digits(n),d[n[i]+1]*10^(#n-i)) \\ gives correct value for n=0 iff d[1]=0, since digits(0)=[] in PARI (v.2.6)

cp's OEIS Frontend

A180540 Primes that become a different prime under the mapping 3 <=> 4.

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