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A119748 Numbers that are not the sum of a prime and a (nontrivial, positive) power. 2
1, 2, 5, 1549, 1771561 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

From a question raised by Tanya Khovanova.

1771561 = 11^6 is the first composite number here. - T. D. Noe, Sep 29 2011

James Van Buskirk and John Robertson report that these are the only terms known up to 10^10. - Charles R Greathouse IV, Jan 30 2014

LINKS

Table of n, a(n) for n=1..5.

John Robertson, Integers of the form x^2+kp (1999)

CROSSREFS

Cf. A119747.

Sequence in context: A176117 A078748 A051131 * A101341 A079014 A215436

Adjacent sequences:  A119745 A119746 A119747 * A119749 A119750 A119751

KEYWORD

nonn,more

AUTHOR

David W. Wilson, Jul 30 2006

EXTENSIONS

1771561 from Max Alekseyev, Jul 31 2006

STATUS

approved

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Last modified December 21 09:07 EST 2014. Contains 252300 sequences.