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A034970
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a(n) is the greatest prime factor of a(n-2)*a(n-1)-1.
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2
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2, 3, 5, 7, 17, 59, 167, 821, 2539, 1042259, 508903, 5765312303, 1461701, 1404527126434567, 2034580216153, 97552206663238517, 3105563257, 46137561830961960349, 9777395920402541, 6719860896292085951563127, 5367788603966004659, 33011914147
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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PROG
| (PARI) A034970(a, b) = {local(f); f=factor(a*b-1); f[matsize(f)[1], 1]}
a=2; b=3; print(a); print(b)
for(n=2, 28, c=A034970(a, b); print(c); a=b; b=c)
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CROSSREFS
| Sequence in context: A100532 A040149 A168034 * A048417 A071710 A048403
Adjacent sequences: A034967 A034968 A034969 * A034971 A034972 A034973
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KEYWORD
| nonn,easy,nice
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AUTHOR
| Erich Friedman (erich.friedman(AT)stetson.edu).
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EXTENSIONS
| Cf. A031441.
More terms from James A. Sellers (sellersj(AT)math.psu.edu)
Terms corrected by Michael B. Porter (michael_b_porter(AT)yahoo.com), Mar 14 2010
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