107,1

This sequence shows that the difference between a composite number and a prime rests on the modification of a sinlge decimal digit of the given composite integer.

(RSA-2048)- 10^107 = prime

Position[PrimeQ[Table[ \

251959084756578934940271832400483985714292821262040320277771378360436620207075\

955562640185258807844069182906412495150821892985591491761845028084891200728449\

926873928072877767359714183472702618963750149718246911650776133798590957000973\

304597488084284017974291006424586918171951187461215151726546322822168699875491\

824224336372590851418654620435767984233871847744479207399342365848238242811981\

638150106748104516603773060562016196762561338441436038339044149526344321901146\

575444541784240209246165157233507787077498171257724679629263863563732899121548\

31438167899885040445364023527381951378636564391212010397122822120720357 - \

10^n, {n, 1617}]], True]

Sequence in context: A142638 A069759 A059258 this_sequence A114356 A113471 A057388

Adjacent sequences: A113929 A113930 A113931 this_sequence A113933 A113934 A113935

nonn

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