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A249969 Numbers whose squares remain squares when prepended with 3 and appended with 25 in base 10. 7
84, 300, 534, 392166, 25187182950, 1675378405584, 6748194721416, 212785600968020747190, 246624720867076739070, 287933960432096347620, 575531271763737072600, 1788090425875335255534, 89384713972121461210716, 14369004287087858450382160956449766 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Conjecture: squares of numbers in the sequence ends in either 00 or 56.

a(17) >= 10^50. - Hiroaki Yamanouchi, Nov 22 2014

LINKS

Hiroaki Yamanouchi, Table of n, a(n) for n = 1..16

EXAMPLE

300^2 = 90000, 39000025 = 6245^2.

CROSSREFS

Cf. A249968, A249633, A249621.

Sequence in context: A137210 A220009 A160321 * A306516 A131072 A210645

Adjacent sequences:  A249966 A249967 A249968 * A249970 A249971 A249972

KEYWORD

nonn,base

AUTHOR

Chai Wah Wu, Nov 10 2014

STATUS

approved

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Last modified July 29 11:53 EDT 2021. Contains 346346 sequences. (Running on oeis4.)