

A100758


Greatest prime factor of the concatenation of terms of the nth 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
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OFFSET

2,1


COMMENTS

Are these concatenations squarefree?


LINKS

Table of n, a(n) for n=2..12.


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

Cf. A100755, A100756, A100757, A008277.
Sequence in context: A201484 A216573 A140004 * A083763 A185127 A287295
Adjacent sequences: A100755 A100756 A100757 * A100759 A100760 A100761


KEYWORD

base,easy,nonn


AUTHOR

Amarnath Murthy, Nov 23 2004


EXTENSIONS

More terms from R. J. Mathar, Aug 07 2007


STATUS

approved



