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 A074832 Primes whose binary reversal is also prime. 22
 3, 5, 7, 11, 13, 17, 23, 29, 31, 37, 41, 43, 47, 53, 61, 67, 71, 73, 83, 97, 101, 107, 113, 127, 131, 151, 163, 167, 173, 181, 193, 197, 199, 223, 227, 229, 233, 251, 257, 263, 269, 277, 283, 307, 313, 331, 337, 349, 353, 359, 373, 383, 409, 421, 431, 433, 443 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS By definition, all Mersenne primes are in this sequence. - Roderick MacPhee, Apr 18 2015 LINKS T. D. Noe, Table of n, a(n) for n=1..10000 K. S. Brown's Mathpages, Reflective and Cyclic Sets of Primes EXAMPLE 349 = 101011101, reverse the sequence of ones and zeros: 101110101 = 373 which is also prime. MATHEMATICA Prime[ Select[ Range[100], PrimeQ[ FromDigits[ Reverse[ IntegerDigits[ Prime[ # ], 2]], 2]] &]] PROG (C++) for(int p=0; p<100; p++) { int rp = bitrev(p); if(isprime(p) && isprime(rp)) cout << p << " "; } (Python) from sympy import isprime, prime A074832 = [prime(n) for n in range(1, 10**6) if isprime(int(bin(prime(n))[:1:-1], 2))] # Chai Wah Wu, Aug 14 2014 CROSSREFS Cf. A007500 (primes whose decimal reversal is also prime). Sequence in context: A096169 A225526 A090670 * A075794 A192864 A135832 Adjacent sequences:  A074829 A074830 A074831 * A074833 A074834 A074835 KEYWORD base,easy,nonn AUTHOR Robert G. Wilson v, Sep 09 2002 STATUS approved

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Last modified June 24 04:02 EDT 2021. Contains 345416 sequences. (Running on oeis4.)