login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A162190 Triangle read by rows in which row n lists the divisors of n, the n-th prime and the consecutive composites that are greater than the n-th prime, with a(0)=1. 2
1, 1, 2, 1, 2, 3, 4, 1, 3, 5, 6, 1, 2, 4, 7, 8, 9, 10, 1, 5, 11, 12, 1, 2, 3, 6, 13, 14, 15, 16, 1, 7, 17, 18, 1, 2, 4, 8, 19, 20, 21, 22, 1, 3, 9, 23, 24, 25, 26, 27, 28, 1, 2, 5, 10, 29, 30, 1, 11, 31, 32, 33, 34, 35, 36, 1, 2, 3, 4, 6, 12, 37, 38, 39, 40 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..74.

Omar E. Pol, Illustration of initial terms: Divisors and pi(x)

Omar E. Pol, Determinacion geometrica de los numeros primos y perfectos

EXAMPLE

Triangle begins:

1;

1,(2);

1,.2,(3),4;

1,....3,...(5),6;

1,.2,....4,......(7),8,.9,10;

1,..........5,..............(11),12;

1,.2,.3,.......6,..................(13),14,15,16;

1,................7,............................(17),18;

1,.2,....4,..........8,................................(19),20,21,22;

CROSSREFS

Cf. A000005, A000040, A000720, A027750, A018253, A160811, A160812, A161205, A161344, A161345, A161424, A006446, A161827, A161828, A161835. .

Sequence in context: A169778 A255560 A046653 * A134292 A205123 A108715

Adjacent sequences:  A162187 A162188 A162189 * A162191 A162192 A162193

KEYWORD

easy,nonn,tabf

AUTHOR

Omar E. Pol, Jun 30 2009

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 25 16:08 EDT 2019. Contains 322461 sequences. (Running on oeis4.)