A180467 Six-digit integers that are concatenation and product of three 2-digit primes.

111967, 112961, 113119, 113129, 115943, 116143, 117113, 137953, 191771, 196789, 197173, 199723, 233147, 237917, 237961, 296141, 312329, 314183, 378359, 378397, 431941, 612943

Offset

1,1

Comments

There are 22 such integers: 111967=19*71*83, 112961=37*43*71, 113119=31*41*89, 113129=29*47*83, 115943=23*71*71, 116143=37*43*73, 117113=17*83*83, 137953=29*67*71, 191771=37*71*73, 196789=47*53*79, 197173=37*73*73, 199723=29*71*97, 233147=53*53*83, 237917=53*67*67, 237961=47*61*83, 296141=43*71*97, 312329=53*71*83, 314183=41*79*97, 378359=71*73*73, 378397=47*83*97, 431941=61*73*97, 612943=71*89*97.

Links

Table of n, a(n) for n=1..22.

Example

sp = p1<>p2<p3> = q1*q2*q3: 111967 = 11<>19<>67 = 19*71*83, 112961 = 11<>29<>61 = 37*43*71.

Crossrefs

Cf. A180344.

Sequence in context: A237154 A203739 A172699 * A210131 A111332 A151841

Adjacent sequences: A180464 A180465 A180466 * A180468 A180469 A180470

Keyword

nonn,base,fini,full

Author

Zak Seidov, Jan 19 2011

Status

approved