A073468 First n-digit prime in the concatenation of the even integers allowing leading zeros.

2, 41, 101, 8101, 30323, 1021, 2468101, 42628303, 246810121, 8101214161, 68101214161, 890929496981, 1081101121141, 68890929496981, 202224262830323, 828486889092949, 58606264666870727, 618202224262830323

Offset

1,1

Comments

Leading zeros count but are not printed (cf. A073186).

Links

Harvey P. Dale, Table of n, a(n) for n = 1..100

Example

a(6)=1021 because first 6-digit string in 246810121416182022242628303234... that forms a prime is "001021".

Mathematica

With[{c=Flatten[IntegerDigits/@(2Range[100])]}, Table[SelectFirst[ FromDigits/@ Partition[c, n, 1], PrimeQ], {n, 20}]] (* Harvey P. Dale, Jul 14 2019 *)

Crossrefs

Sequence in context: A100514 A377718 A285792 * A073186 A103335 A047936

Adjacent sequences: A073465 A073466 A073467 * A073469 A073470 A073471

Keyword

nonn,base

Author

Zak Seidov, Aug 22 2002

Extensions

More terms from Sascha Kurz, Feb 02 2003

Name modified by Sean A. Irvine, Jan 31 2025

Status

approved