WON plate29 | World!OfNumbers Share the amusements of  G. L. Honaker, Jr.when he discovered this beautiful cryptic prime curioabout palprimes 191 & 383 Let A = 1, B = 2, C = 3, etc. [More info at Puzzle 33 from Carlos Rivera's PP&P website]  PALINDROMES ARE FUN  My most favourite axioma!P+A+L+I+N+D+R+O+M+E+S+A+R+E+F+U+N The sum of these letters is 191 a palindromic prime ! The palindromic prime 15551 written out in English words : FIFTEEN THOUSAND FIVE HUNDRED FIFTY ONE F+I+F+T+E+E+N+T+H+O+U+S+A+N+D+F+I+V+E+H+U+N+D+R+E+D+F+I+F+T+Y+O+N+E These letters add to 383 again a palindromic prime ! (15551 is the 'smallest' palprime with this property.) A neat fact is that 191 & 383 form the lowest threedigit Palindromic Sophie Germain Prime pair. 2(191)+1 = 383 Concatenate all the threedigit palprimes without 191 101_131_151_181_313_353_373_383_727_757_787_797_919_929 and you'll find that this number is divisible by 383 ! Visit also Eric W. Weisstein's page about Sophie Germain Primes ! [Women in Math] [Sloane A005384] [Marie-Sophie Germain (1776-1831)] [Sophie Germain Primes] [Palindromic Sophie Germain Primes] [Yves Gallot's Proth.exe and Cunningham Chains] A result from Carlos Rivera's work on adding the letters of written_out numbers (in English) is that he proved that these two 9-digit numbers are equal ! 123456789 = 987654321 Please visit my Nine Digits Page to see how he came to this conclusion ! Another less known fact is that 383 divides the Mersenne number 2191 – 1 A000029 Prime Curios! Prime Puzzle Richard Phillips Wikipedia 29 Le Nombre 29 Numberland 29
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