The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A077356

(Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A077356

Squares whose external digits (MSD and LSD) form a square. Or squares from which deleting the internal digits leaves a square.
(history; published version)

#11 by OEIS Server at Sat Sep 21 22:56:50 EDT 2024

LINKS

Andrew Howroyd, <a href="/A077356/b077356_1.txt">Table of n, a(n) for n = 1..10000</a>

#10 by Michael De Vlieger at Sat Sep 21 22:56:50 EDT 2024

STATUS

proposed

approved

Discussion

Sat Sep 21

22:56

OEIS Server: Installed first b-file as b077356.txt.

#9 by Andrew Howroyd at Sat Sep 21 22:10:41 EDT 2024

STATUS

editing

proposed

#8 by Andrew Howroyd at Sat Sep 21 20:05:57 EDT 2024

DATA

0, 1, 4, 9, 16, 25, 36, 49, 64, 81, 196, 225, 841, 1156, 1296, 1936, 2025, 3136, 4489, 6084, 6724, 8281, 10816, 11236, 12996, 13456, 15376, 15876, 17956, 18496, 21025, 24025, 27225, 30276, 30976, 33856, 34596, 37636, 38416, 41209, 42849, 45369, 47089, 49729, 61504

OFFSET

0,3

1,3

LINKS

Andrew Howroyd, <a href="/A077356/b077356_1.txt">Table of n, a(n) for n = 1..10000</a>

EXAMPLE

10816 = 104^2 is a member term as deleting its internal digits (081) leaves 16, a square.

PROG

(PARI) lista(n)={my(L=List(), k=0); while(#L<n, my(x=k^2); if(x<100 || issquare(x\10^logint(x, 10)*10+x%10), listput(L, x)); k++); Vec(L)} \\ Andrew Howroyd, Sep 21 2024

EXTENSIONS

Offset changed and a(42) onwards from Andrew Howroyd, Sep 21 2024

STATUS

approved

editing

#7 by N. J. A. Sloane at Wed Jan 15 21:02:30 EST 2014

STATUS

proposed

approved

#6 by Jon E. Schoenfield at Wed Jan 15 20:31:59 EST 2014

STATUS

editing

proposed

Discussion

Wed Jan 15

20:51

Jon E. Schoenfield: This should have Offset = 1, because it's a list ... right?

#5 by Jon E. Schoenfield at Wed Jan 15 20:31:55 EST 2014

DATA

OFFSET

0,23

EXTENSIONS

0 inserted by Jon E. Schoenfield, Jan 15 2014

STATUS

approved

editing

#4 by N. J. A. Sloane at Thu Dec 05 19:55:52 EST 2013

AUTHOR

_Amarnath Murthy (amarnath_murthy(AT)yahoo.com), _, Nov 05 2002

Discussion

Thu Dec 05

19:55

OEIS Server: https://oeis.org/edit/global/2075

#3 by Russ Cox at Sat Mar 31 10:26:36 EDT 2012

EXTENSIONS

More terms from _Erich Friedman (efriedma(AT)stetson.edu), _, Aug 08 2005

Discussion

Sat Mar 31

10:26

OEIS Server: https://oeis.org/edit/global/502

#2 by N. J. A. Sloane at Wed Sep 21 03:00:00 EDT 2005

DATA

1, 4, 9, 16, 25, 36, 49, 64, 81, 196, 225, 841, 1156, 1296, 1936, 2025, 3136, 4489, 6084, 6724, 8281, 10816, 11236, 12996, 13456, 15376, 15876, 17956, 18496, 21025, 24025, 27225, 30276, 30976, 33856, 34596, 37636, 38416, 41209, 42849

KEYWORD

base,nonn,new

EXTENSIONS

More terms from Erich Friedman (efriedma(AT)stetson.edu), Aug 08 2005