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A072966 Numbers which are not the sum of two semiprimes. 9
0, 1, 2, 3, 4, 5, 6, 7, 9, 11, 17, 22, 33 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Is this sequence finite?

See the graph of sequence A072931 for compelling evidence that 33 is the last term of this sequence. - T. D. Noe, Apr 11 2007

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

a(10) = 11 since there is no way to represent 11 as a sum of two semiprimes. 13 is not a term since 13 = 4 + 9.

CROSSREFS

Cf. A001358.

Sequence in context: A214321 A005577 A263362 * A245761 A059759 A042952

Adjacent sequences:  A072963 A072964 A072965 * A072967 A072968 A072969

KEYWORD

nonn,more

AUTHOR

Lior Manor Aug 13 2002

STATUS

approved

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Last modified November 18 12:21 EST 2017. Contains 294891 sequences.