The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A162192 Triangle read by rows in which row n lists the divisors of n, prime(n), the consecutive composites that are greater than prime(n), and prime (n+1), but row 0 is formed by 1 and 2. 0
 1, 2, 1, 2, 3, 1, 2, 3, 4, 5, 1, 3, 5, 6, 7, 1, 2, 4, 7, 8, 9, 10, 11, 1, 5, 11, 12, 13, 1, 2, 3, 6, 13, 14, 15, 16, 17, 1, 7, 17, 18, 19, 1, 2, 4, 8, 19, 20, 21, 22, 23, 1, 3, 9, 23, 24, 25, 26, 27, 28, 29, 1, 2, 5, 10, 29, 30, 31 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS See also A162190, a sequence with a similar structure. LINKS Omar E. Pol, Illustration: Divisors and pi(x) EXAMPLE Triangle begins: 1,(2); 1,(2),(3); 1,.2.,(3),4,(5); 1,.....3,...(5),6,(7); 1,.2,.....4,......(7),8,.9,10,(11); 1,...........5,...............(11),12,(13); 1,.2,..3,.......6,....................(13),14,15,16,(17); 1,.................7,...............................(17),18,(19); 1,.2,.....4,..........8,....................................(19),20,21,22,(23); CROSSREFS Cf. A000005, A000040, A000720, A027750, A018253, A160811, A160812, A161205, A161344, A161345, A161424, A006446, A161827, A161828, A161835, A162190. Sequence in context: A037125 A194029 A194055 * A329795 A329794 A238954 Adjacent sequences:  A162189 A162190 A162191 * A162193 A162194 A162195 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.

Last modified June 21 10:09 EDT 2021. Contains 345360 sequences. (Running on oeis4.)