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PROJECT EULER · #0402

Integer-valued Polynomials

Statement only · UnsolvedOriginal problem ↗

It can be shown that the polynomial n4+4n3+2n2+5n is a multiple of 6 for every integer n. It can also be shown that 6 is the largest integer satisfying this property.

Define M(a,b,c) as the maximum m such that n4+an3+bn2+cn is a multiple of m for all integers n. For example, M(4,2,5)=6.

Also, define S(N) as the sum of M(a,b,c) for all 0<a,b,cN.

We can verify that S(10)=1972 and S(10000)=2024258331114.

Let Fk be the Fibonacci sequence:
F0=0, F1=1 and
Fk=Fk1+Fk2 for k2.

Find the last 9 digits of S(Fk) for 2k1234567890123.

Write-up coming later

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