A168352 Products of 6 distinct odd primes.

255255, 285285, 345345, 373065, 435435, 440895, 451605, 465465, 504735, 533715, 555555, 569415, 596505, 608685, 615615, 636405, 645645, 672945, 680295, 692835, 705705, 719355, 726495, 752115, 770385, 780045, 795795, 803985, 805035, 811965, 823515, 838695, 844305, 858585

Offset

1,1

Links

David A. Corneth, Table of n, a(n) for n = 1..10000

Formula

A067885 INTERSECT A005408. [R. J. Mathar, Nov 24 2009]

Example

255255 = 3*5*7*11*13*17
285285 = 3*5*7*11*13*19
345345 = 3*5*7*11*13*23
435435 = 3*5*7*11*13*29

Mathematica

f[n_]:=Last/@FactorInteger[n]=={1, 1, 1, 1, 1, 1}&&FactorInteger[n][[1, 1]]>2; lst={}; Do[If[f[n], AppendTo[lst, n]], {n, 6*9!}]; lst

Prog

(PARI) is(n) = {n%2 == 1 && factor(n)[, 2]~ == [1, 1, 1, 1, 1, 1]} \\ David A. Corneth, Aug 26 2020
(Python)
from sympy import primefactors, factorint
print([n for n in range(1, 1000000, 2) if len(primefactors(n)) == 6 and max(list(factorint(n).values())) == 1]) # Karl-Heinz Hofmann, Mar 01 2023

Crossrefs

Cf. A005408, A067885.

Cf. A046391 (5 distinct odd primes).

Sequence in context: A140079 A321505 A034631 * A147579 A087025 A249915

Adjacent sequences: A168349 A168350 A168351 * A168353 A168354 A168355

Keyword

nonn,easy

Author

Vladimir Joseph Stephan Orlovsky, Nov 23 2009

Extensions

Definition corrected by R. J. Mathar, Nov 24 2009

More terms from David A. Corneth, Aug 26 2020

Status

approved