1,2

Next terms are a(15) = 2^1685 - 18010000530080323, a(16) = 2^1685 - 18010000529304693.

Table of n, a(n) for n=1..14.

Cf. A139020, A139021.

Sequence in context: A156672 A145669 A215427 * A031869 A194854 A045360

Adjacent sequences: A139016 A139017 A139018 * A139020 A139021 A139022

nonn

Leroy Quet, Apr 06 2008

Corrected and extended by M. F. Hasler, Apr 06 2008

a(11)-a(14) from Donovan Johnson, Nov 30 2008

a(15)-a(16) from Max Alekseyev, Feb 01 2010

approved