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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 June 25 13:13 EDT 2024. Contains 373705 sequences. (Running on oeis4.)