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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A000173 Unitary-sociable numbers (smallest member of each cycle). 3
 30, 1482, 2418, 24180, 35238, 263820, 395730, 473298, 698130, 763620, 2212026, 2233554, 172459210, 209524210, 341354790, 384121920, 525150234, 530946330, 582129630, 1799281330, 2069510520, 2514290520, 3344596854, 5251502340 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS If n=product p_i^a_i, d=product p_i^c_i is a unitary divisor of n if each c_i is 0 or a_i. REFERENCES R. K. Guy, Unsolved Problems in Number Theory, 3rd edition, Sect. B7. LINKS Herman Jamke (hermanjamke(AT)fastmail.fm), Nov 01 2006, Table of n, a(n) for n = 1..44 David Moews, Perfect, amicable and sociable numbers. J. O. M. Pedersen, Tables of Aliquot Cycles. [Broken link] J. O. M. Pedersen, Tables of Aliquot Cycles. [Via Internet Archive Wayback-Machine] J. O. M. Pedersen, Tables of Aliquot Cycles. [Cached copy, pdf file only] Eric Weisstein's World of Mathematics, Sociable Numbers. CROSSREFS Cf. A034444, A003416, A097323. Sequence in context: A048536 A369143 A318496 * A055351 A103917 A196464 Adjacent sequences: A000170 A000171 A000172 * A000174 A000175 A000176 KEYWORD nonn,nice AUTHOR N. J. A. Sloane EXTENSIONS More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Nov 01 2006 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 February 26 13:41 EST 2024. Contains 370352 sequences. (Running on oeis4.)