(38G) OEIS A262389: Last Digit Composite

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(38G) OEIS A262389: Last Digit Composite

09-13-2017, 06:09 PM (This post was last modified: 09-14-2017 05:37 AM by Gerald H.)

Post: #4

Gerald H Offline

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Posts: 1,627
Joined: May 2014

RE: (38G) OEIS A262389: Last Digit Composite

Bravo Didier!

On 38G you must have brackets around (NOT(N MOD 4)) then it works OK.

I tried a formula, but yours beats mine.

Here's mine:

Code:

RECURSE(U,(5*N+1-U2(N)+(3+U2(N))*U2((2*N-3-U2(N))/4)/2)/2,4,6)►U1(N):

CHECK 1:

RECURSE(U,IFTE(N MOD 2,-1,1),-1,1)►U2(N):

just for the record.

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RE: (38G) OEIS A262389: Last Digit Composite - Gerald H - 09-13-2017 06:09 PM

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