

A247267


Square numbers not divisible by 100 that remain square when their mostsignificant (or leftmost) digit is removed.


2



1, 4, 9, 49, 64, 81, 225, 625, 1225, 2025, 3025, 4225, 5625, 7225, 9025, 15625, 27225, 30625, 34225, 42025, 50625, 60025, 70225, 75625, 81225, 93025, 105625, 275625, 330625, 600625, 893025, 950625, 970225, 1050625, 2030625, 3330625, 4950625, 9455625, 9765625, 15405625
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OFFSET

1,2


COMMENTS

Subsequence of A225885. It is easy to see that the multiples of 100 in A225885 are earlier entries of the sequence multiplied by 100, so this sequence removes this redundancy in some sense. It appears that all entries in A225885 after the first 3 entries ends in either 25 or 00, so this sequence appears to end in 25 after the first 3 entries.


LINKS

Chai Wah Wu, Table of n, a(n) for n = 1..1185


PROG

(PARI) for(n=10, 10^6, if(n%100, if(issquare(n)&&issquare(n%(10^(#Str(n)1))), print1(n, ", ")))) \\ Derek Orr, Nov 01 2014


CROSSREFS

Cf. A225885, A247885. A249587.
Sequence in context: A013495 A164839 A225885 * A115687 A115711 A029791
Adjacent sequences: A247264 A247265 A247266 * A247268 A247269 A247270


KEYWORD

nonn,base


AUTHOR

Chai Wah Wu, Nov 01 2014


EXTENSIONS

Added 1, 4, 9 to sequence to match A225885  Chai Wah Wu, Nov 03 2014


STATUS

approved



