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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A059755 Odd rare numbers: odd n such that n-r and n+r are squares, where r is the reverse of n. 2
 65, 868591084757, 6979302951885, 6157577986646405, 8052956026592517, 8052956206592517, 8650327689541457, 8650349867341457, 619431353040136925, 619631153042134925, 631688638047992345, 633288858025996145, 633488632647994145, 653488856225994125 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS There are 20 terms up to 10^22. - Shyam Sunder Gupta, Dec 14 2019 REFERENCES Shyam Sunder Gupta, "Systematic computations of rare numbers", The Mathematics Education, Vol. XXXII, No. 3, 1998. LINKS Shyam Sunder Gupta, Table of n, a(n) for n = 1..20 C. Rivera, Prime Puzzles Page Shyam Sunder Gupta, Rare Numbers EXAMPLE 65-56 = 9 and 65 + 56 = 121 are both (perfect) squares. CROSSREFS Cf. A035519. Sequence in context: A185823 A035519 A238842 * A215657 A157631 A085503 Adjacent sequences:  A059752 A059753 A059754 * A059756 A059757 A059758 KEYWORD nice,nonn,base AUTHOR Shyam Sunder Gupta, Feb 11 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 18 22:37 EDT 2022. Contains 353826 sequences. (Running on oeis4.)