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A059755 Odd rare numbers: odd n such that n-r and n+r are squares, where r is the reverse of n. 1
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

REFERENCES

Shyam Sunder Gupta, "Systematic computations of rare numbers", The Mathematics Education, Vol. XXXII, No. 3, 1998.

LINKS

Table of n, a(n) for n=1..14.

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

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Last modified March 28 22:27 EDT 2017. Contains 284249 sequences.