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 A117495 Product of a prime number p and the number of primes smaller than p. 5
 0, 3, 10, 21, 44, 65, 102, 133, 184, 261, 310, 407, 492, 559, 658, 795, 944, 1037, 1206, 1349, 1460, 1659, 1826, 2047, 2328, 2525, 2678, 2889, 3052, 3277, 3810, 4061, 4384, 4587, 5066, 5285, 5652, 6031, 6346, 6747, 7160, 7421, 8022, 8299, 8668, 8955, 9706 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Jens Kruse Andersen, Table of n, a(n) for n = 1..10000 FORMULA a(n) = (n-1)*prime(n). - Zak Seidov, Aug 15 2010 EXAMPLE a(9) = 184 because (1) the 9th prime number is 23, (2) there are 8 primes smaller than 23 and (3) 23*8 = 184. MAPLE with(numtheory):a:=n->sum(ithprime(n), j=2..n):seq(a(n), n=1..47); # Zerinvary Lajos, Aug 24 2008 MATHEMATICA Table[(n - 1)Prime[n], {n, 60}] (* Zak Seidov, Aug 15 2010 *) PROG (PARI) a(n)=prime(n)*(n-1) \\ Charles R Greathouse IV, Sep 15 2014 CROSSREFS Cf. A000720, A033286, A036689. Sequence in context: A210980 A207380 A268348 * A007687 A330273 A335666 Adjacent sequences: A117492 A117493 A117494 * A117496 A117497 A117498 KEYWORD nonn,easy AUTHOR Luc Stevens (lms022(AT)yahoo.com), Apr 25 2006 EXTENSIONS a(31) corrected by Jens Kruse Andersen, Sep 15 2014 STATUS approved

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Last modified September 7 05:42 EDT 2024. Contains 375729 sequences. (Running on oeis4.)