1,2

Apart from the first term, identical to A089226. - R. J. Mathar, May 31 2008

Table of n, a(n) for n=1..31.

a(n) = MIN{k such that k is in A018252 and A000120(k) = n}.

a(10) = 1023 because 1023 base 2 = 1111111111 which has 10 1's and 1023 = 3 * 11 * 31 is nonprime.

Cf. A061712.

Sequence in context: A218005 A063600 A116926 * A242832 A114634 A088017

Adjacent sequences: A140327 A140328 A140329 * A140331 A140332 A140333

easy,base,nonn

Jonathan Vos Post, May 26 2008

More terms from R. J. Mathar, May 31 2008

approved