This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A046705 Palindromic primes whose product of digits is a prime. 1
 2, 3, 5, 7, 131, 151, 11311, 1117111, 111111151111111, 111111111111111111131111111111111111111, 1111111111111111111111111111111117111111111111111111111111111111111, 1111111111111111111111111111111111111111111115111111111111111111111111111111111111111111111 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Except for the first 4 terms, a subsequence of A088281. - Chai Wah Wu, Dec 17 2015 Subsequence of A028842, of A046703, and also of A117058. - Michel Marcus, Dec 18 2015 LINKS Chai Wah Wu, Table of n, a(n) for n = 1..15 MATHEMATICA t = Prime[Range[4]]; Union[Select[Flatten[Table[NestList[FromDigits[Flatten[{1, IntegerDigits[#], 1}]] &, n, 45], {n, t}]], PrimeQ]] (* Jayanta Basu, Jun 27 2013 *) PROG (Python) from __future__ import division from sympy import isprime A046705_list = [n for n in ((10**(2*l+1)-1)//9+d*10**l for l in range(100) for d in [1, 2, 4, 6]) if isprime(n)] # Chai Wah Wu, Dec 17 2015 CROSSREFS Cf. A028842, A046703, A088281, A117058. Sequence in context: A082805 A071119 A157869 * A054218 A075048 A281021 Adjacent sequences:  A046702 A046703 A046704 * A046706 A046707 A046708 KEYWORD base,nonn AUTHOR STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified July 20 11:55 EDT 2018. Contains 312804 sequences. (Running on oeis4.)