1,2

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

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

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

Cf. A119747.

Sequence in context: A176117 A078748 A051131 * A101341 A079014 A215436

Adjacent sequences: A119745 A119746 A119747 * A119749 A119750 A119751

nonn,more

David W. Wilson, Jul 30 2006

1771561 from Max Alekseyev, Jul 31 2006

approved