A178800 Smaller of two consecutive numbers with prime signature {1,2,3}.

41624, 177624, 336500, 515096, 625975, 686375, 767124, 789399, 816776, 829575, 985959, 1035800, 1059624, 1173500, 1184183, 1276856, 1340199, 1365875, 1369575, 1614500, 1784871, 1790199, 1890567, 2078199, 2175875, 2219624, 2364200, 2379351, 2540600

Offset: 1

Author

Will Nicholes, Jun 15 2010

Keywords

• nonn

Comments

The numbers in this sequence are described by both A052213 (consecutive numbers with the same prime signature) and A163569 (numbers with prime signature {1,2,3}).

Links

• Donovan Johnson, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A163569, A052213.

Programs

PARI

e=vector(3); for(n=360, 2540600, if(omega(n)==3, if(bigomega(n)==6, if(omega(n+1)==3, if(bigomega(n+1)==6, for(m=n, n+1, f=factorint(m); for(j=1, 3, e[j]=f[j,2]); e=vecsort(e); for(j=1, 3, if(e[j]<>j, next(3)))); print1(n ", ")))))) \\ Donovan Johnson, Dec 17 2013

Extensions

Extended by Ray Chandler, Jul 30 2010