A073186 First n-digit prime in "the sequence of even integers": 246810121416182022242628303234...

2, 41, 101, 8101, 30323, 141161, 2468101, 42628303, 246810121, 8101214161, 68101214161, 890929496981, 1081101121141, 68890929496981, 202224262830323, 6416616817017217, 58606264666870727, 618202224262830323

Offset

1,1

Comments

Leading zeros are forbidden (cf. A073468).

Links

Table of n, a(n) for n=1..18.

Example

a(6)=141161 because first 6-digit prime in "the sequence of even integers": 246810121416182022242628303234... is 141161 (omiiting initial zeros, otherwise 6 successive integers which give first "6-digital" prime are "001021" )

Mathematica

p200=Flatten[IntegerDigits[2*Range[200]]]; Do[pn=Partition[p200, n, 1]; ln=Length[pn]; tab=Table[Sum[10^(n-k)*pn[[i, k]], {k, n}], {i, ln}]; tas=Select[tab, PrimeQ]; Print[{n, tas[[1]], tas[[2]], tas[[3]]}], {n, 20}]

Crossrefs

Sequence in context: A100514 A285792 A073468 * A103335 A047936 A007533

Adjacent sequences: A073183 A073184 A073185 * A073187 A073188 A073189

Keyword

nonn,base

Author

Zak Seidov, Aug 22 2002

Extensions

Corrected and extended by Sascha Kurz, Feb 02 2003

Status

approved