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A086290 Minimal exponent in prime factorization of 7-smooth numbers. +0
4
0, 1, 1, 2, 1, 1, 1, 3, 2, 1, 1, 1, 1, 4, 1, 1, 1, 1, 2, 3, 1, 1, 5, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 6, 1, 2, 1, 1, 4, 1, 1, 1, 1, 2, 1, 2, 1, 1, 3, 1, 7, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 1, 3, 1, 2, 1, 5, 1, 1, 1, 8, 1, 1, 2, 1, 1, 1, 1, 2, 1, 3, 1, 1, 1, 1, 1, 2, 2, 1, 1, 3, 2, 1, 1 (list; graph; listen)
OFFSET

1,4

COMMENT

a(n) = A051904(A002473(n));

a(n) <= A086291(n) <= A086289(n).

CROSSREFS

Sequence in context: A071178 A072776 A077481 this_sequence A136568 A039961 A108299

Adjacent sequences: A086287 A086288 A086289 this_sequence A086291 A086292 A086293

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 15 2003

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Last modified November 21 14:49 EST 2008. Contains 150807 sequences.


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