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 A065516 Differences between products of 2 primes. 64
 2, 3, 1, 4, 1, 6, 1, 3, 1, 7, 1, 1, 3, 1, 7, 3, 2, 4, 2, 1, 4, 3, 4, 5, 3, 5, 3, 1, 1, 4, 2, 1, 1, 11, 5, 4, 3, 1, 2, 1, 1, 6, 4, 1, 7, 1, 1, 2, 1, 9, 3, 1, 2, 5, 3, 8, 1, 5, 2, 2, 7, 7, 1, 1, 2, 1, 3, 4, 1, 1, 2, 1, 1, 2, 5, 9, 2, 10, 2, 4, 1, 5, 3, 3, 2, 7, 4, 9, 2, 2, 4, 3, 1, 2, 1, 1, 2, 4, 5, 5, 2, 2, 3, 1, 2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS See A215231 and A085809 for record values and where they occur: A215231(n) = a(A085809(n)). - Reinhard Zumkeller, Mar 23 2014 LINKS T. D. Noe, Table of n, a(n) for n=1..10000 FORMULA a(n) = A001358(n+1) - A001358(n). EXAMPLE a(6) = A001358(7) - A001358(6) = 21 - 15 = 6. MATHEMATICA Differences[Select[Range[329], PrimeOmega[#] == 2 &]] (* Arkadiusz Wesolowski, Nov 24 2011 *) PROG (PARI) {spg(m)=local(a, b); a=0; b=4; for(n=5, m, if(bigomega(n) == 2, a=n; print1(a-b", "); b=a; ))} (Haskell) a065516 n = a065516_list !! (n-1) a065516_list = zipWith (-) (tail a001358_list) a001358_list -- Reinhard Zumkeller, Mar 23 2014 CROSSREFS A166237 is the version for distinct primes. Cf. A001358, A239656. Sequence in context: A279820 A235791 A035426 * A375511 A280699 A214967 Adjacent sequences: A065513 A065514 A065515 * A065517 A065518 A065519 KEYWORD easy,nonn AUTHOR Lior Manor, Nov 27 2001 EXTENSIONS More terms from Jason Earls, Jul 24 2003 STATUS approved

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Last modified September 15 17:15 EDT 2024. Contains 375938 sequences. (Running on oeis4.)