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A290397 Least number of nonprime squarefree numbers (A000469) that add up to n. 0
1, 2, 3, 4, 5, 1, 2, 3, 4, 1, 2, 2, 3, 1, 1, 2, 3, 3, 4, 2, 1, 1, 2, 2, 2, 1, 2, 2, 2, 1, 2, 2, 1, 1, 1, 2, 2, 1, 1, 2, 2, 1, 2, 2, 2, 1, 2, 2, 2, 2, 1, 2, 2, 2, 1, 2, 1, 1, 2, 2, 2, 1, 2, 2, 1, 1, 2, 2, 1, 1, 2, 2, 2, 1, 2, 2, 1, 1, 2, 2, 2, 1, 2, 2, 1, 1, 1, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

It is conjectured that a(n) <= 5.

LINKS

Table of n, a(n) for n=1..88.

EXAMPLE

a(6) = 1 because 6 is already nonprime squarefree number.

a(7) = 2 because 7 = 6 + 1 is a partition of 7 into 2 nonprime squarefree parts and there is no such partition with fewer terms.

CROSSREFS

Cf. A000469, A051034, A225926, A239508, A290136.

Sequence in context: A190595 A280502 A276757 * A053841 A010884 A105932

Adjacent sequences:  A290394 A290395 A290396 * A290398 A290399 A290400

KEYWORD

nonn

AUTHOR

Ilya Gutkovskiy, Jul 29 2017

STATUS

approved

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Last modified February 25 13:30 EST 2018. Contains 299654 sequences. (Running on oeis4.)