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A129295 Numbers m such that m^3-1 has no divisors d with 1<d<m-1. 4
3, 4, 6, 8, 12, 14, 20, 24, 38, 54, 62, 80, 90, 110, 138, 150, 164, 168, 192, 194, 272, 278, 314, 332, 348, 398, 402, 434, 500, 572, 642, 644, 720, 728, 762, 798, 812, 860, 864, 878, 920, 992, 1020, 1022, 1070, 1092, 1098, 1118, 1130, 1182, 1202, 1230, 1260, 1308 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A129294(a(n)) = #{1, a(n)-1} = 2.

LINKS

Table of n, a(n) for n=1..54.

EXAMPLE

{1,11,157,1727} is the set of divisors of 12^3-1, therefore 12 is a term, A129294(12) = #{1,11} = 2.

CROSSREFS

Cf. A129293, A129295.

Sequence in context: A232721 A227956 A225531 * A192276 A049305 A147606

Adjacent sequences:  A129292 A129293 A129294 * A129296 A129297 A129298

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Apr 09 2007

STATUS

approved

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Last modified December 21 10:46 EST 2014. Contains 252305 sequences.