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A166566 Primes p such that product of digits - 1 is prime. 1
3, 13, 23, 29, 31, 41, 43, 61, 67, 83, 89, 113, 127, 131, 163, 167, 181, 223, 233, 239, 241, 269, 271, 277, 283, 293, 311, 347, 349, 383, 421, 431, 439, 443, 457, 461, 463, 467, 479, 487, 523, 541, 547, 563, 569, 613, 617, 619, 631, 641, 643, 647, 653, 659 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

EXAMPLE

23 is in sequence because 2*3-1=5; 83 because 8*3-1=23; 163 because 1*6*3-1=17.

MATHEMATICA

Select[Prime[Range[150]], PrimeQ[Times@@IntegerDigits[#] - 1]&] (* Vincenzo Librandi, Sep 14 2012 *)

CROSSREFS

Sequence in context: A299645 A180970 A135580 * A011533 A277965 A043501

Adjacent sequences:  A166563 A166564 A166565 * A166567 A166568 A166569

KEYWORD

nonn,base

AUTHOR

Vincenzo Librandi, Oct 28 2009

EXTENSIONS

Corrected (3, 29 inserted) by R. J. Mathar, Nov 30 2009

STATUS

approved

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Last modified April 3 15:51 EDT 2020. Contains 333197 sequences. (Running on oeis4.)