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Search: id:A045973
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A045973 a(1)=10; if n = Product p_i^e_i, n>1, then a(n) = Product p_{i+1}^e_i * Product p_{i+3}^e_i. +0
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10, 21, 55, 441, 91, 1155, 187, 9261, 3025, 1911, 247, 24255, 391, 3927, 5005, 194481, 551, 63525, 713, 40131, 10285, 5187, 1073, 509355, 8281, 8211, 166375, 82467, 1271, 105105, 1591, 4084101, 13585, 11571, 17017, 1334025, 1927, 14973, 21505, 842751 (list; graph; listen)
OFFSET

1,1

REFERENCES

From a puzzle proposed by Marc LeBrun (mlb(AT)well.com).

CROSSREFS

Sequence in context: A048697 A090076 A156592 this_sequence A095679 A095192 A096564

Adjacent sequences: A045970 A045971 A045972 this_sequence A045974 A045975 A045976

KEYWORD

easy,nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

EXTENSIONS

More terms from David W. Wilson (davidwwilson(AT)comcast.net).

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.


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