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A073489 Squarefree numbers having exactly three prime gaps. 6
1870, 2090, 2470, 2530, 2990, 3190, 3410, 3458, 3770, 3910, 4030, 4070, 4186, 4510, 4730, 4810, 4930, 5170, 5187, 5270, 5278, 5330, 5474, 5510, 5590, 5642, 5830, 5890, 6110, 6279, 6290, 6490, 6710, 6734, 6890, 6902, 6970, 7030, 7130, 7310, 7370, 7378 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A073484(a(n)) = 3.

LINKS

Table of n, a(n) for n=1..42.

EXAMPLE

1870 is a term, as 1870 = 2*5*11*17 = with three gaps: between 2 and 5, between 5 and 11 and between 11 and 17.

CROSSREFS

Sequence in context: A306864 A306877 A073495 * A232040 A054817 A270244

Adjacent sequences:  A073486 A073487 A073488 * A073490 A073491 A073492

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Aug 03 2002

STATUS

approved

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Last modified February 24 13:05 EST 2020. Contains 332209 sequences. (Running on oeis4.)