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 A046301 Product of 3 successive primes. 28
 30, 105, 385, 1001, 2431, 4199, 7429, 12673, 20677, 33263, 47027, 65231, 82861, 107113, 146969, 190747, 241133, 290177, 347261, 409457, 478661, 583573, 716539, 871933, 1009091, 1113121, 1201289, 1317919, 1564259, 1879981, 2279269, 2494633, 2837407, 3127361, 3532343 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Vincenzo Librandi and K. D. Bajpai, Table of n, a(n) for n = 1..10000 (first 1000 terms from Vincenzo Librandi) FORMULA Sum_{n>=1} 1/a(n) = A242187. - Amiram Eldar, Nov 19 2020 EXAMPLE From K. D. Bajpai, Aug 27 2014: (Start) a(2) = 105 is in the sequence because 105 = 3* 5 * 7, product of three successive primes. a(3) = 385 is in the sequence because 385 = 5 * 7 * 11, product of three successive primes. (End) MAPLE A046301:=n->ithprime(n)*ithprime(n+1)*ithprime(n+2): seq(A028560(n), n=1..100); # K. D. Bajpai, Aug 27 2014 MATHEMATICA Table[Prime[n] Prime[n+1] Prime[n+2], {n, 50}] (* K. D. Bajpai, Aug 27 2014 *) Times@@@Partition[Prime[Range[40]], 3, 1] (* Harvey P. Dale, Mar 25 2019 *) PROG (Magma) [NthPrime(n)*NthPrime(n+1)*NthPrime(n+2): n in [1..31]]; /* Or: */ [&*[ NthPrime(n+k): k in [0..2] ]: n in [1..31] ]; // Bruno Berselli, Feb 25 2011 (PARI) a(n)=prime(n)*prime(n+1)*prime(n+2); \\ Joerg Arndt, Aug 30 2014 (Haskell) a046301 n = a046301_list !! (n-1) a046301_list = zipWith3 (((*) .) . (*)) a000040_list (tail a000040_list) (drop 2 a000040_list) -- Reinhard Zumkeller, May 12 2015 CROSSREFS Cf. A002110, A006094, A046302, A046303, A046324, A046325, A046326, A046327. Cf. A000040, A242187, A257891. Sequence in context: A081370 A257891 A158445 * A193873 A266955 A205836 Adjacent sequences: A046298 A046299 A046300 * A046302 A046303 A046304 KEYWORD nonn,easy AUTHOR Patrick De Geest, Jun 15 1998 EXTENSIONS Offset changed from 0 to 1 by Vincenzo Librandi, Jan 16 2012 STATUS approved

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Last modified November 26 21:15 EST 2022. Contains 358362 sequences. (Running on oeis4.)