OFFSET
1,1
COMMENTS
"11" must be read: "At position 1, there is a 1". And indeed, there is, when considering the sequence as a string of concatenated digits;
"21" reads: "At position 2, there is a 1" - which is true;
"41" reads: "At position 4, there is a 1" - which is also true;
"54" reads: "At position 5, there is a 4" - which is also true;
...
"101" reads: "At position 10, there is a 1" - which is true (the 1 in 61); etc.
We don't read the 2 of 21 as this 2 is a prime digit. Thus 32 and 75 are not in the sequence.
LINKS
Carole Dubois, Table of n, a(n) for n = 1..2322
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Carole Dubois and Eric Angelini, Mar 15 2020
STATUS
approved