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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A165974 Irregular triangle read by rows: floor(j^2 / p) for p prime and j = 1 to p-1. 12

%I

%S 0,0,1,0,0,1,3,0,0,1,2,3,5,0,0,0,1,2,3,4,5,7,9,0,0,0,1,1,2,3,4,6,7,9,

%T 11,0,0,0,0,1,2,2,3,4,5,7,8,9,11,13,15,0,0,0,0,1,1,2,3,4,5,6,7,8,10,

%U 11,13,15,17,0,0,0,0,1,1,2,2,3,4,5,6,7,8,9,11,12,14,15,17,19,21

%N Irregular triangle read by rows: floor(j^2 / p) for p prime and j = 1 to p-1.

%C The irregular triangle of numbers is:

%C ....j..1..2..3..4..5..6..7..8..9.10.11.12.13.14.15.16.17.18.19.20.21.22

%C ..p

%C ..2....0

%C ..3....0..1

%C ..5....0..0..1..3

%C ..7....0..0..1..2..3..5

%C .11....0..0..0..1..2..3..4..5..7..9

%C .13....0..0..0..1..1..2..3..4..6..7..9.11

%C .17....0..0..0..0..1..2..2..3..4..5..7..8..9.11.13.15

%C .19....0..0..0..0..1..1..2..3..4..5..6..7..8.10.11.13.15.17

%C .23....0..0..0..0..1..1..2..2..3..4..5..6..7..8..9.11.12.14.15.17.19.21

%H C. H. Gribble, <a href="/A165974/b165974.txt">Flattened irregular triangle read by rows of primes < 300</a>

%Y Cf. A165993 (row sums).

%K nonn,tabf

%O 1,7

%A _Christopher Hunt Gribble_, Oct 02 2009

%E Keyword:tabf added by _R. J. Mathar_, Oct 09 2009

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.

Last modified February 7 16:06 EST 2023. Contains 360128 sequences. (Running on oeis4.)