OFFSET
0,1
COMMENTS
8-spoke wheel overlays prime number spiral; hub is 2 in shell 0; 8 spokes radiate from this hub; this is Northeast, clockwise.
LINKS
Ivan Panchenko, Table of n, a(n) for n = 0..1000
FORMULA
EXAMPLE
Begin a prime number spiral at shell 0 (prime 2), proceed clockwise, Northeast.
From Omar E. Pol, Feb 19 2022: (Start)
The spiral with four terms in every spoke looks like this:
.
227 101--103--107--109--113--127
| | |
223 97 29---31---37---41 131
| | | | |
211 89 23 3----5 43 137
| | | | | | |
199 83 19 2 7 47 139
| | | | | |
197 79 17---13---11 53 149
| | | |
193 73---71---67---61---59 151
| |
191--181--179--173--167--163--157
.
(End)
MATHEMATICA
Table[ Prime[4n^2 - 10n + 7], {n, 1, 40} ]
PROG
(Magma) [NthPrime(4*n^2 - 10*n + 7): n in [1..40]]; // Vincenzo Librandi, Aug 29 2018
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Enoch Haga and G. L. Honaker, Jr., Apr 10 2000
EXTENSIONS
Edited by Robert G. Wilson v, Feb 25 2002
STATUS
approved