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 A077320 Triangle in which n-th row contains n smallest multiples of the n-th prime. 3
 2, 3, 6, 5, 10, 15, 7, 14, 21, 28, 11, 22, 33, 44, 55, 13, 26, 39, 52, 65, 78, 17, 34, 51, 68, 85, 102, 119, 19, 38, 57, 76, 95, 114, 133, 152, 23, 46, 69, 92, 115, 138, 161, 184, 207, 29, 58, 87, 116, 145, 174, 203, 232, 261, 290 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS 0. A000040 (primes) gives initial terms of rows. 1. A033286 contains the final terms of rows. 2. Sum of the n-th row = prime(n)*A000217(n), by definition. 3. a(A000217(n) + 1) = prime(n+1), by definition. LINKS Ivan Neretin, Table of n, a(n) for n = 1..8128 FORMULA T(n,k) = k*prime(n) with 1 <= k <= n. - Bruno Berselli, Sep 05 2017 EXAMPLE From Bruno Berselli, Sep 05 2017: (Start) Triangle begins: 2; 3, 6; 5, 10, 15; 7, 14, 21, 28; 11, 22, 33, 44, 55; 13, 26, 39, 52, 65, 78; 17, 34, 51, 68, 85, 102, 119; 19, 38, 57, 76, 95, 114, 133, 152; 23, 46, 69, 92, 115, 138, 161, 184, 207; 29, 58, 87, 116, 145, 174, 203, 232, 261, 290; 31, 62, 93, 124, 155, 186, 217, 248, 279, 310, 341; 37, 74, 111, 148, 185, 222, 259, 296, 333, 370, 407, 444; 41, 82, 123, 164, 205, 246, 287, 328, 369, 410, 451, 492, 533; 43, 86, 129, 172, 215, 258, 301, 344, 387, 430, 473, 516, 559, 602, etc. (End) MATHEMATICA Table[Prime[n]*Range[n], {n, 10}] // Flatten (* Ivan Neretin, May 02 2019 *) CROSSREFS Cf. A000040, A000217, A033286. Row sums give A196421. - Omar E. Pol, Mar 12 2012 Sequence in context: A350801 A073740 A239956 * A339195 A344085 A019565 Adjacent sequences: A077317 A077318 A077319 * A077321 A077322 A077323 KEYWORD nonn,tabl,easy AUTHOR Amarnath Murthy, Nov 04 2002 STATUS approved

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Last modified February 25 02:17 EST 2024. Contains 370308 sequences. (Running on oeis4.)