login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A219526 Number of 3 x 3 squares filled by 9 consecutive primes prime(n) to prime(n+8) such that sums along rows, columns and diagonals are primes. 1

%I

%S 928,4360,3648,2816,2208,2120,1520,0,688,768,936,560,1112,544,80,384,

%T 624,320,1568,120,32,0,168,56,272,160,24,168,32,72,776,440,24,208,32,

%U 0,24,224,648,680,0,152,56,24,16,0,0,0,0,0,0,24,0,184,160,16,32,40

%N Number of 3 x 3 squares filled by 9 consecutive primes prime(n) to prime(n+8) such that sums along rows, columns and diagonals are primes.

%C All terms are multiples of 8.

%H Zak Seidov, <a href="/A219526/b219526.txt">Table of n, a(n) for n = 2..100</a>

%e .3...5..11

%e 17...7..13

%e 23..29..19

%e sums along rows: 3+5+11 = 19, 17+7+13 = 37, 23+29+19 = 71,

%e sums along columns: 3+17+23 = 42, 5+7+29 = 41, 11+13+19 = 43,

%e sums along diagonals: 3+7+19 = 29, 11+7+23 = 41.

%K nonn

%O 2,1

%A _Zak Seidov_, Nov 21 2012

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 26 13:17 EDT 2022. Contains 354092 sequences. (Running on oeis4.)