OFFSET
1,2
COMMENTS
The odd digits are 1, 3, 5, 7 and 9. This is not a permutation of the natural numbers as 100 and 102 cannot be part of the sequence, for instance.
EXAMPLE
a(1) = 1 jumps over 1 digit and lands on 3, an odd digit;
a(2) = 2 jumps over 2 digits and lands on 5, an odd digit;
a(5) = 5 jumps over 5 digits and lands on the last 1 of 11, an odd digit;
a(5) = 6 jumps over 6 digits and lands on the 3 of 13, an odd digit;
a(10) = 11: the first 1 of 11 jumps over 1 digit and lands on the 1 of 13, an odd digit;
a(10) = 11: the last 1 of 11 jumps over 1 digit and lands on the 3 of 13, an odd digit; etc.
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Eric Angelini and Giorgos Kalogeropoulos, Oct 29 2023
STATUS
approved