OFFSET
1,8
COMMENTS
LINKS
Antti Karttunen, Table of squares with sizes 1x1 .. 30x30, flattened
FORMULA
a(n) = A121997(n)-1. - M. F. Hasler, Feb 16 2014
EXAMPLE
This irregular table begins as:
0;
0,1;
0,1;
0,1,2;
0,1,2;
0,1,2;
0,1,2,3;
0,1,2,3;
0,1,2,3;
0,1,2,3;
0,1,2,3,4;
0,1,2,3,4;
0,1,2,3,4;
0,1,2,3,4;
0,1,2,3,4;...
PROG
(Python)
from sympy import integer_nthroot
def A237451(n): return (n-(k:=(m:=integer_nthroot(3*n, 3)[0])+(6*n>m*(m+1)*((m<<1)+1)))*(k-1)*((k<<1)-1)//6-1)%k # Chai Wah Wu, Nov 04 2024
CROSSREFS
KEYWORD
nonn,tabf,easy
AUTHOR
Antti Karttunen, Feb 08 2014
STATUS
approved