A199819 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A199819

Primes of the form 10^n-9^n

2

19, 271, 5217031, 68618940391, 8649148282327007911, 95289871302753755165078396311

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..9

MATHEMATICA

Select[10^Range[3000]-9^Range[3000], PrimeQ]

PROG

(Magma) [ a: n in [0..400] | IsPrime(a) where a is 10^n-9^n ]

CROSSREFS

Cf. A016189, A062576

Sequence in context: A125476 A016248 A322539 * A016187 A016184 A197742

Adjacent sequences: A199816 A199817 A199818 * A199820 A199821 A199822

KEYWORD

nonn

AUTHOR

Vincenzo Librandi, Nov 21 2011

STATUS

approved