A077334 Smallest number beginning with 9 and having exactly n distinct prime divisors.

9, 91, 90, 910, 9030, 90090, 903210, 9699690, 900029130, 9146807670, 901741380540, 9426343036110, 900781858106130, 90004386781078770, 914836017997511610, 90100977291211496610, 9000008798605567472730, 900002983747159323401370

Offset

1,1

Links

Table of n, a(n) for n=1..18.

Example

a(2) = 91 = 13*7.

Prog

(PARI) a(n) = {i = prod(i=1, n, prime(i)); while ((digits(i)[1] != 9) || (omega(i)!= n), i++); i; } \\ Michel Marcus, Sep 14 2013

Crossrefs

Cf. A077326, A077327, A077328, A077329, A077330, A077331, A077332, A077333.

Cf. A106411-A106419, A106421-A106429.

Sequence in context: A274953 A157558 A157584 * A020243 A239867 A217959

Adjacent sequences: A077331 A077332 A077333 * A077335 A077336 A077337

Keyword

base,nonn

Author

Amarnath Murthy, Nov 04 2002

Extensions

a(5)-a(10) from Ray Chandler, Apr 17 2005

More terms from Ray Chandler, May 02 2005

Status

approved