A271799 Prime numbers whose reversal is a product of 3 distinct primes.

223, 269, 281, 457, 499, 839, 1049, 1289, 1373, 1459, 1543, 1609, 2003, 2011, 2017, 2027, 2029, 2053, 2081, 2087, 2213, 2221, 2237, 2239, 2243, 2267, 2269, 2293, 2297, 2441, 2459, 2609, 2657, 2659, 2693, 2699, 2803, 2833, 2851, 2857, 2879, 2887, 2897, 3449, 3557

Offset: 1

Author

Chai Wah Wu, Apr 14 2016

Keywords

• nonn
• base

Comments

Each of the three distinct primes must have an exponent of one, i.e., the number of distinct primes and also the number of primes counted with multiplicity must equal three. - Harvey P. Dale, Sep 26 2024

Links

• Chai Wah Wu, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A270175, A007304.

Programs

Mathematica

Select[Range[4000], PrimeQ[#] && Transpose[FactorInteger[IntegerReverse[#]]][[2]] == {1, 1, 1} &] (* Tanya Khovanova, Mar 16 2021 *)
Select[Prime[Range[500]],PrimeNu[IntegerReverse[#]]==PrimeOmega[IntegerReverse[#]]==3&] (* Harvey P. Dale, Sep 26 2024 *)