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Search: id:A076610
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A076610 Numbers having only prime factors of form prime(prime); a(1)=1. +0
1
1, 3, 5, 9, 11, 15, 17, 25, 27, 31, 33, 41, 45, 51, 55, 59, 67, 75, 81, 83, 85, 93, 99, 109, 121, 123, 125, 127, 135, 153, 155, 157, 165, 177, 179, 187, 191, 201, 205, 211, 225, 241, 243, 249, 255, 275, 277, 279, 283, 289, 295, 297, 327, 331, 335, 341, 353, 363 (list; graph; listen)
OFFSET

1,2

COMMENT

Multiplicative closure of A006450.

EXAMPLE

99 = 11*3*3 = A000040(A000040(3))*A000040(A000040(1))^2, therefore 99 is a term.

CROSSREFS

Adjacent sequences: A076607 A076608 A076609 this_sequence A076611 A076612 A076613

Sequence in context: A101114 A120696 A071156 this_sequence A069205 A064988 A052092

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Oct 21 2002

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Last modified May 11 10:28 EDT 2008. Contains 139662 sequences.


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