login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual appeal: Please make a donation to keep the OEIS running! Over 6000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A063991 Unitary amicable numbers. 20
114, 126, 1140, 1260, 18018, 22302, 32130, 40446, 44772, 49308, 56430, 64530, 67158, 73962, 142310, 168730, 180180, 197340, 223020, 241110, 242730, 286500, 296010, 308220, 365700, 429750, 462330, 548550, 591030, 618570, 669900 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

C. A. Pickover, The Math Book, Sterling, NY, 2009; see p. 90.

LINKS

Table of n, a(n) for n=1..31.

R. M. Najar, The Unitary Amicable Pairs To 10^8

J. M. Pedersen, Known Unitary Amicable Pairs

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]

I. Peterson, Amicable Pairs, Divisors and a New Record

Eric Weisstein's World of Mathematics, Unitary Amicable Pair

CROSSREFS

Union of A002952 and A002953.

Sequence in context: A057440 A113537 A127664 * A292020 A292019 A065118

Adjacent sequences:  A063988 A063989 A063990 * A063992 A063993 A063994

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Sep 18 2001

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified December 12 15:01 EST 2017. Contains 295939 sequences.