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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
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
Sequence in context: A280133 A192411 A179563 * A009741 A322309 A009745
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.)