OFFSET
1,2
COMMENTS
No digit 0 is admitted in a(n) in order to avoid leading zeroes after the concatenation.
LINKS
Jean-Marc Falcoz, Table of n, a(n) for n = 1..10002
EXAMPLE
The 1st digit of the sequence (1) concatenated to the 1st term = 11 (prime);
the 2nd digit of the sequence (1) concatenated to the 2nd term = 113 (prime);
the 3rd digit of the sequence (3) concatenated to the 3rd term = 37 (prime);
the 4th digit of the sequence (7) concatenated to the 4th term = 73 (prime);
the 5th digit of the sequence (3) concatenated to the 5th term = 311 (prime);
the 6th digit of the sequence (1) concatenated to the 6th term = 19 (prime);
the 7th digit of the sequence (1) concatenated to the 7th term = 127 (prime);
the 8th digit of the sequence (9) concatenated to the 8th term = 919 (prime);
the 9th digit of the sequence (2) concatenated to the 9th term = 223 (prime);
etc.
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Eric Angelini and Jean-Marc Falcoz, Feb 20 2019
STATUS
approved