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A113934 (RSA-704) + 10^n = prime where RSA-704 is the 212 decimal digit unfactored RSA challenge number. 0
206, 356, 1274, 1528, 1568, 2402 (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 integer.

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

(RSA-704)+ 10^206 is prime.

MATHEMATICA

Position[PrimeQ[Table[ \

740375634795617128280467960974295731425931888892312890849362326389727650340282\

662768919964196251178439958943305021275853701189680982867331732731089309005525\

05116877063299072396380786710086096962537934650563796359 + 10^n, {n, 2000}]], \

True]

PROG

(PARI) \\ Set N to RSA-704

for(n=1, 1e4, if(ispseudoprime(N+10^n), print1(n", "))) \\ Charles R Greathouse IV, Oct 05 2011

CROSSREFS

Sequence in context: A025343 A222619 A252270 * A260101 A113490 A054007

Adjacent sequences:  A113931 A113932 A113933 * A113935 A113936 A113937

KEYWORD

nonn

AUTHOR

Joao da Silva (zxawyh66(AT)yahoo.com), Jan 30 2006

EXTENSIONS

a(6) from Charles R Greathouse IV, Oct 05 2011

STATUS

approved

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Last modified June 21 16:39 EDT 2021. Contains 345365 sequences. (Running on oeis4.)