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 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: A046653 A308897 A353293 * A349325 A134292 A344006 Adjacent sequences: A162187 A162188 A162189 * A162191 A162192 A162193 KEYWORD easy,nonn,tabf AUTHOR Omar E. Pol, Jun 30 2009 STATUS approved

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Last modified May 26 12:04 EDT 2024. Contains 372825 sequences. (Running on oeis4.)