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User:JeanBernard François
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$whoami?
I'm JeanBernard François (aka infofiltrage) born in France the 03/05/69 & DP Engineer (Engineering Graphics Software).
My current blog is Bondissant (almost art from geometry).
I love number theory, mathematics, and of course OEIS.
I only worked under Debian Linux System with LibreOffice, Inkscape and a LiberKey.
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Collatz  Diophantine  Primes  Number Theory
[talk]
Sequence of the Day for February 24
A109671:a (1) = 1 
k ≥ 1 
a (2 k) = a (k) 
a (2 k + 1) 
 a (2 k + 1) − a (2 k − 1)  = a (k) 

{ 1, 1, 2, 1, 1, 2, 3, 1, 2, 1, 1, 2, 3, 3, 6, 1, 5, ... }
2 k − 1 