The OEIS is supported by the many generous donors to the OEIS Foundation.

 Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 60th year, we have over 367,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”). Other ways to Give
 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A113620 Numbers whose 3 prime powers are a permutation of each other. Numbers with 3 distinct prime factors whose 3 exponents are a permutation of the 3 bases. 0
 21600, 36000, 48600, 121500, 169344, 225000, 337500, 395136, 857304, 3000564, 6690816, 19600000, 24532992, 37380096, 53782400, 59295096, 88942644, 122500000, 161980416, 171478296, 658834400, 774400000, 943130628, 1022754816, 2155524696, 2344190625, 4326400000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..27. FORMULA {a(n)} = {p(1)^a * p(2)^b * p(3)^c for 3 distinct primes p(1), p(2), p(3) such that (a, b, c) is a permutation of (p(1), p(2), p(3))}. EXAMPLE 21600 = 2^5 * 3^3 * 5^2 36000 = 2^5 * 3^2 * 5^3 48600 = 2^3 * 3^5 * 5^2 121500 = 2^2 * 3^5 * 5^3 169344 = 2^7 * 3^3 * 7^2 225000 = 2^3 * 3^2 * 5^5 337500 = 2^2 * 3^3 * 5^5 395136 = 2^7 * 3^2 * 7^3 857304 = 2^3 * 3^7 * 7^2 3000564 = 2^2 * 3^7 * 7^3 6690816 = 2^11 * 3^3 * 11^2 24532992 = 2^11 * 3^2 * 11^3 37380096 = 2^13 * 3^3 * 13^2 59295096 = 2^3 * 3^2 * 7^7 88942644 = 2^2 * 3^3 * 7^7 161980416 = 2^13 * 3^2 * 13^3 171478296 = 2^3 * 3^11 * 11^2 943130628 = 2^2 * 3^11 * 11^3 2155524696 = 2^3 * 3^13 * 13^2 2344190625 = 3^7 * 5^5 * 7^3 4594613625 = 3^7 * 5^3 * 7^5 6511640625 = 3^5 * 5^7 * 7^3 14010910524 = 2^2 * 3^13 * 13^3 25015118625 = 3^5 * 5^3 * 7^7 35452265625 = 3^3 * 5^7 * 7^5 69486440625 = 3^3 * 5^5 * 7^7 736820803125 = 3^11 * 5^5 * 11^3 3083660425988 = 2^2 * 3^3 * 11^11 3566212687125 = 3^11 * 5^3 * 11^5 15792626953125 = 3^5 * 5^11 * 11^3 20542440283992 = 2^3 * 3^2 * 11^11 212323095703125 = 3^3 * 5^11 * 11^5 8666341994809125 = 3^5 * 5^3 * 11^11 21807007674642216 = 2^3 * 3^2 * 13^13 24073172207803125 = 3^3 * 5^5 * 11^11 32710511511963324 = 2^2 * 3^3 * 13^13 CROSSREFS Cf. A113855. Sequence in context: A211236 A221002 A190470 * A074812 A037160 A271021 Adjacent sequences: A113617 A113618 A113619 * A113621 A113622 A113623 KEYWORD easy,nonn AUTHOR Jonathan Vos Post, Jan 26 2006 EXTENSIONS a(10)-a(27) from Giovanni Resta, Jun 13 2016 STATUS approved

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

Last modified December 11 02:45 EST 2023. Contains 367717 sequences. (Running on oeis4.)