OFFSET
1,4
COMMENTS
This sequence is a variant of A026242 where each value, say v, appears twice at indices k and k + v for some k.
Graphically, we have three lines.
Apparently every positive integer appears in the sequence.
LINKS
Rémy Sigrist, Table of n, a(n) for n = 1..10000
Rémy Sigrist, PARI program for A307664
EXAMPLE
For n = 1:
- we can set a(1) = a(2) = a(3) = 1.
For n = 4:
- we can set a(4) = a(6) = a(8) = 2.
For n = 5:
- a(8) is already known, hence a(5) <> 3,
- we can set a(5) = a(9) = a(13) = 4.
PROG
(PARI) See Links section.
CROSSREFS
KEYWORD
nonn
AUTHOR
Rémy Sigrist, Apr 20 2019
STATUS
approved