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 A079802 Group the prime numbers so that the sum of the terms of the n-th group is a multiple of that of the (n-1)-st group: (2), (3,5), (7,11,13,17), (19,23,29,31,37...,79,83), ...; a(n) = sum of n-th group. 3
 2, 8, 48, 816, 74256, 2335722480, 3265147014612865200 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..7. PROG (PARI) p=2; print1(s=p, ", "); while(s<10^9, p=nextprime(p+1); a=p; while(a%s>0, p=nextprime(p+1); a=a+p); print1(s=a, ", ")) CROSSREFS Cf. A079803, A079804, A079805. Sequence in context: A280133 A192411 A179563 * A009741 A322309 A009745 Adjacent sequences: A079799 A079800 A079801 * A079803 A079804 A079805 KEYWORD nonn AUTHOR Amarnath Murthy, Feb 05 2003 EXTENSIONS a(5), a(6) and PARI code from Klaus Brockhaus, Feb 13 2003 a(7) from Ryan Propper, Aug 29 2005 STATUS approved

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Last modified April 16 05:35 EDT 2024. Contains 371697 sequences. (Running on oeis4.)