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A030465 Numbers n such that n concatenated with n+1 is a square. 21
183, 328, 528, 715, 6099, 13224, 40495, 106755, 453288, 2066115, 2975208, 22145328, 28027683, 110213248, 110667555, 147928995, 178838403, 226123528, 275074575, 333052608, 378698224, 445332888, 446245635 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Also called Sastry numbers. - Lekraj Beedassy, Jul 18 2008

REFERENCES

J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 183, p. 56, Ellipses, Paris 2008.

LINKS

Giovanni Resta, Table of n, a(n) for n = 1..198 (terms < 10^20)

CROSSREFS

Cf. A030466, A030467, A054214, A054215, A054216, A020339, A020340.

Sequence in context: A217608 A264779 A133609 * A147270 A147124 A261110

Adjacent sequences:  A030462 A030463 A030464 * A030466 A030467 A030468

KEYWORD

nonn,base

AUTHOR

Patrick De Geest

STATUS

approved

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Last modified October 15 18:18 EDT 2018. Contains 316237 sequences. (Running on oeis4.)