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A249968 Numbers whose squares remain squares when prepended with 2 and appended with 25 in base 10. 8
16, 14130, 42260, 491230, 11192300, 18172350, 20878660, 565802820, 592874284, 2765209166, 19789454240, 35082937167210, 393840573502266, 7027165155369334, 12621688931426416, 14721538161161584, 24823861761554840, 26825614715841966, 707326082998942734 (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(73) >= 10^50. - Hiroaki Yamanouchi, Nov 22 2014
LINKS
Chai Wah Wu and Hiroaki Yamanouchi, Table of n, a(n) for n = 1..72 (terms a(1)-a(62) from Chai Wah Wu)
EXAMPLE
14130^2 = 199656900, 219965690025 = 469005^2.
CROSSREFS
Sequence in context: A223102 A167062 A233140 * A017188 A168576 A013831
KEYWORD
nonn,base
AUTHOR
Chai Wah Wu, Nov 09 2014
STATUS
approved

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Last modified June 20 14:54 EDT 2024. Contains 373526 sequences. (Running on oeis4.)