A069613 - cp's OEIS frontend

A069613 a(1) = 1; a(2n) is smallest prime starting with a(2n-1) and a number with no insignificant zeros, and a(2n+1) is smallest prime ending in a(2n-1). Alternate left and right concatenation yielding primes.

n	a(n)
1	1
2	11
3	211
4	2111
5	22111
6	2211127
7	12211127
8	122111279
9	14122111279
10	1412211127927
11	211412211127927
12	21141221112792721
13	1321141221112792721
14	132114122111279272169
15	27132114122111279272169
16	2713211412211127927216947

[1, 11, 211, 2111, 22111, 2211127, 12211127, 122111279, 14122111279, 1412211127927, 211412211127927, 21141221112792721, 1321141221112792721, 132114122111279272169, 27132114122111279272169, 2713211412211127927216947]

cp's OEIS Frontend

A069613 a(1) = 1; a(2n) is smallest prime starting with a(2n-1) and a number with no insignificant zeros, and a(2n+1) is smallest prime ending in a(2n-1). Alternate left and right concatenation yielding primes.

Table of values

List of values