OFFSET
1,3
COMMENTS
EXAMPLE
PROG
(PARI) a(n) = {my(t=n*(n+1)/2, k = n+1); while(t >= k, t -= k; k++); t; } \\ Michel Marcus, Aug 16 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
Bob Andriesse, Aug 13 2019
STATUS
approved