1,2

Conjecture: no term is zero.

Table of n, a(n) for n=1..75.

a(3) = 2 as 2221 is a prime. a(4) = 3 as 33331 is a prime but 11111 and 22221 are not.

a(8) = 30 and the prime arising is 30303030303030301.

Cf. A087604, A087605, A087606, A087607, A087608, A087609.

Cf. A086923.

Cf. A086766.

Sequence in context: A065801 A265705 A205237 * A182021 A117451 A130970

Adjacent sequences: A086917 A086918 A086919 * A086921 A086922 A086923

base,nonn

Amarnath Murthy, Sep 18 2003

More terms from Ray G. Opao, Apr 15 2004

More terms from David Wasserman, Apr 12 2005

approved