The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A113931 (RSA-1536)-10^n = prime where RSA-1536 is the 463 decimal digit unfactored RSA challenge number. 0
 84, 99, 564 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS This sequence shows that the difference between a composite number and a prime rests on the modification of a single decimal digit of the given composite number. LINKS EXAMPLE (RSA-1536)-10^84 = prime MATHEMATICA Position[PrimeQ[Table[ \ 184769970321174147430683562020016440301854933866341017147178577491065169671116\ 124985933768430543574458561606154457179405222971773252466096064694607124962372\ 044202226975675668737842756238950876467844093328515749657884341508847552829818\ 672645133986336493190808467199043187438128336350279547028265329780293491615581\ 188104984490831954500984839377522725705257859194499387007369575568843693381277\ 9613089230392569695253261620823676490316036551371447913932347169566988069 - \ 10^n, {n, 1463}]], True] PROG (PARI) \\ Set N to RSA-1536 for(n=1, 463, if(ispseudoprime(N-10^n), print1(n", "))) CROSSREFS Sequence in context: A219183 A289218 A329182 * A214866 A111313 A157119 Adjacent sequences:  A113928 A113929 A113930 * A113932 A113933 A113934 KEYWORD nonn,bref,base,fini,full AUTHOR Joao da Silva (zxawyh66(AT)yahoo.com), Jan 30 2006 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
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified June 20 10:07 EDT 2021. Contains 345162 sequences. (Running on oeis4.)