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User:Jean-Bernard François
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$whoami?
I'm Jean-Bernard 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
Sequence of the Day |
[talk]
Sequence of the Day for April 24
A187677: Primes of the form8 n 2 + 6 n − 1 |
221 | 223 | 225 | 227 | 229 | 231 | 233 | 235 |
219 | 145 | 147 | 149 | 151 | 153 | 155 | 157 |
217 | 143 | 85 | 87 | 89 | 91 | 93 | 95 |
215 | 141 | 83 | 41 | 43 | 45 | 47 | 49 |
213 | 139 | 81 | 39 | 13 | 15 | 17 | 19 |
211 | 137 | 79 | 37 | 11 | 1 | 3 | 21 |
209 | 135 | 77 | 35 | 9 | 7 | 5 | 23 |
In a variant of the Ulam spiral in which only odd numbers are entered, some primes still line up along some diagonals but not others. Without the even numbers, primes can also line up in horizontal and diagonal lines. This sequence comes from an upwards vertical line which starts with 13.