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A100758
Greatest prime factor of the concatenation of terms of the n-th row of the triangle formed by the Stirling number of the second kind.
1
11, 131, 587, 1646443, 6827, 18011869, 9120065483, 363724245921599, 975761724248252813688864599, 17542508725666616033, 111131968773953028264114836512440131291369683
OFFSET
2,1
COMMENTS
Are these concatenations squarefree?
FORMULA
a(n) = A006530[A061113(n)]. - R. J. Mathar, Aug 07 2007
EXAMPLE
a(4) = 587 is the greatest prime factor of 1761 =3*587.
CROSSREFS
KEYWORD
base,easy,nonn
AUTHOR
Amarnath Murthy, Nov 23 2004
EXTENSIONS
More terms from R. J. Mathar, Aug 07 2007
STATUS
approved