A036330 Composite numbers n such that juxtaposition of prime factors of n has length 6.

64, 96, 144, 160, 176, 208, 216, 224, 240, 264, 272, 304, 312, 324, 336, 360, 368, 396, 400, 408, 440, 456, 464, 468, 484, 486, 496, 504, 520, 540, 552, 560, 572, 592, 594, 600, 612, 616, 656, 660, 676, 680, 684, 688, 696, 702, 726, 728, 729, 744, 748, 752

Offset

1,1

Comments

The last term of this sequence is a(96411)=994009.

Links

Nathaniel Johnston, Table of n, a(n) for n = 1..10000

Maple

isA036330 := proc(n) local d: d:=ifactors(n)[2]: return `if`(not isprime(n) and add(length(d[j][1])*d[j][2], j=1..nops(d))=6, n, NULL): end: seq(isA036330(n), n=2..752); # Nathaniel Johnston, Jun 22 2011

Mathematica

pf6Q[n_]:=!PrimeQ[n]&&Total[Last[#]IntegerLength[First[#]]&/@FactorInteger[ n]]==6; Select[Range[800], pf6Q]  (* Harvey P. Dale, Jun 19 2012 *)

Crossrefs

Cf. A036326-A036334.

Sequence in context: A114417 A046305 A114828 * A046306 A223086 A175163

Adjacent sequences: A036327 A036328 A036329 * A036331 A036332 A036333

Keyword

nonn,base,fini,easy

Author

Patrick De Geest, Dec 15 1998

Status

approved