OFFSET
1,2
LINKS
Jan Koornstra, Table of n, a(n) for n = 1..10000
EXAMPLE
The first elements are:
1 _ 2 _ _ 3 _ _ _ 4 _ _ _ _ 5 _ _ _ _ _
2 _ _ 3 _ _ _ 4 _ _ _ _ 5 _ _
3 _ _ _ 4 _ _ _ _ 5 _
4 _ _ _ _ 5 _ _
5 _ _ _ _ _
.
1 2 2 3 4 3 3 5 6 4 4 4 7 8 5 5 9 5 5 10
PROG
(Python)
seq = []
for n in range(1, 100): seq += [n] + n*[-1]
for n in range(2, len(seq)):
value = n
gaps = 0
position = n - 1
while position < len(seq):
if seq[position] == -1:
if gaps > 0: gaps -= 1
else:
seq[position] = value
gaps = value
value += 1
position += 1
print(seq)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Jan Koornstra, Aug 21 2019
STATUS
approved