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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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified January 18 23:05 EST 2019. Contains 319282 sequences. (Running on oeis4.)