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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

Table of n, a(n) for n=1..9.

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 October 20 20:02 EDT 2018. Contains 316402 sequences. (Running on oeis4.)