The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A225295 Pandigital numbers with exactly 4 prime factors (with multiplicity). 1
 1023456987, 1023458679, 1023458967, 1023465798, 1023465897, 1023465978, 1023465987, 1023467589, 1023467859, 1023468579, 1023468597, 1023468795, 1023469758, 1023478569, 1023479586, 1023479865, 1023485967, 1023486579, 1023486957, 1023487659, 1023487965, 1023489657, 1023495678 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Charles R Greathouse IV, Table of n, a(n) for n = 1..10000 FORMULA A014613 INTERSECTION A171102. a(n) ~ 6n log n / (log log n)^3. - Charles R Greathouse IV, May 04 2013 EXAMPLE a(1) = 1023456987 = 3^2 * 7 * 16245349. a(2) = 1023458679 = 3^3 * 37905877. a(3) = 1023458967 = 3^2 * 113 * 1006351. a(4) = 1023465897 = 3^2 * 6379 * 17827. a(5) = 1023465987 = 3^2 * 53 * 2145631. a(511032) = 10123456987 = 7^2 * 9833 * 21011. PROG (PARI) is(n)=#vecsort(digits(n), , 8)>9 && bigomega(n)==4 \\ Charles R Greathouse IV, May 04 2013 CROSSREFS Cf. A001358, A014613, A221646. Cf. A050288 (pandigital primes), A175845 (pandigital numbers). Cf. A171102 (3-almost primes). Sequence in context: A204047 A051264 A175845 * A036745 A225218 A268312 Adjacent sequences:  A225292 A225293 A225294 * A225296 A225297 A225298 KEYWORD nonn,base,easy AUTHOR Jonathan Vos Post, May 04 2013 EXTENSIONS a(6)-a(23) from Charles R Greathouse IV, May 04 2013 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified April 12 03:14 EDT 2021. Contains 342912 sequences. (Running on oeis4.)