OFFSET
1,2
COMMENTS
The square digits are 0, 1, 4 and 9. This is not a permutation of the natural numbers as 102 and 103 cannot be part of the sequence, for instance.
EXAMPLE
a(1) = 1 jumps over 1 digit and lands on 4, a square digit;
a(2) = 2 jumps over 2 digits and lands on 9, a square digit;
a(5) = 9 jumps over 9 digits and lands on the 1 of 19, a square digit;
a(6) = 5 jumps over 5 digits and lands on the 1 of 14, a square digit;
a(8) = 10: the 1 of 10 jumps over 1 digit and lands on the first 1 of 11, a square digit;
a(8) = 10: the 0 of 10 jumps over 0 digit and lands on the same square digit; etc.
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Eric Angelini and Giorgos Kalogeropoulos, Oct 29 2023
STATUS
approved