OFFSET
1,2
COMMENTS
No term ends with 1.
EXAMPLE
a(1) = 0, k = 0, and the sum 0 is even;
a(2) = 2, k = 2, and the sum 0 + 2 (= 2) is even;
a(3) = 13, k = 3, and the sum 2 + 1 + 3 (= 6) is even;
a(4) = 4, k = 4, and the sum 2 + 1 + 3 + 4 (= 10) is even;
a(5) = 3, k = 3, and the sum 4 + 3 + 5 (= 12) is even;
a(6) = 5, k = 5, and the sum 1 + 3 + 4 + 3 + 5 (= 16) is even; etc.
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Eric Angelini and Carole Dubois, May 22 2021
STATUS
approved