Two-Dimensional Recurrence

Problem Statement

The Fibonacci sequence $(f_i)$ is the unique sequence such that

  • $f_0=0$
  • $f_1=1$
  • $f_{i+1}=f_i+f_{i-1}$

Similarly, there is a unique function $A(m,n)$ such that

  • $A(0,0)=0$
  • $A(0,1)=1$
  • $A(m+1,n)=A(m,n+1)+A(m,n)$
  • $A(m+1,n+1)=2A(m+1,n)+A(m,n)$

Define $S(k)=\displaystyle\sum_{i=1}^k A(f_i,f_i)$. You are given $S(5)=7200$.

Find $S(11^N)$, giving your answer modulo $1123581313$.

Submit Answers

You need to submit in the format: "N:problem(N)", possibly with multiple values at once, separated by commas, with $N$ between $1$ and $100$.

Top Users

🥇 icy
100.00 (100)
🥈 shs10978
100.00 (100)
🥉 liuguangxi
100.00 (100)

Data

Stats

Your submissions will appear here

Recent Submissions

1
liuguangxi
$g(100)$, $9$ digits 1 month, 1 week ago
2
liuguangxi
$g(99)$, $8$ digits 1 month, 1 week ago
3
liuguangxi
$g(98)$, $8$ digits 1 month, 1 week ago
4
liuguangxi
$g(97)$, $10$ digits 1 month, 1 week ago
5
liuguangxi
$g(96)$, $9$ digits 1 month, 1 week ago