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 A215174 a(n) is the least term of A214723 having n different prime divisors, or 0 if no such term exists. 0
 8, 18, 130, 6890, 254930, 3352570, 683351890, 45139676530, 2744959126130 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Conjectures. 1) For every n, a(n)>0; 2) for n>=3, a(n)==0 (mod 10). If 1) is true, then A215113 is unbounded. The corresponding positions m=m(n) such that A214723(m)=a(n) are 1,3,12,132,2074,18625,2138668. m(8) exists and the calculations show that it is >= 24866450, although up to now the exact its value is unknown. LINKS CROSSREFS Cf. A214723, A215113. Sequence in context: A173734 A219524 A259852 * A171371 A092692 A001151 Adjacent sequences:  A215171 A215172 A215173 * A215175 A215176 A215177 KEYWORD nonn,more AUTHOR Vladimir Shevelev, Zak Seidov, Robert G. Wilson v, Aug 05 2012 EXTENSIONS a(9) from Donovan Johnson, Aug 19 2012 STATUS approved

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Last modified January 20 04:21 EST 2019. Contains 319323 sequences. (Running on oeis4.)