The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A291625

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A291625

Numbers k such that 0 is the smallest decimal digit of k^2.
(history; published version)

#9 by Alois P. Heinz at Mon Aug 28 12:41:34 EDT 2017

STATUS

proposed

approved

#8 by Chai Wah Wu at Mon Aug 28 11:40:38 EDT 2017

STATUS

editing

proposed

#7 by Chai Wah Wu at Mon Aug 28 11:40:23 EDT 2017

PROG

(Python)

A291625_list = [k for k in range(1, 10**6) if '0' in str(k**2)] # Chai Wah Wu, Aug 28 2017

STATUS

approved

editing

#6 by Bruno Berselli at Mon Aug 28 09:19:30 EDT 2017

STATUS

proposed

approved

#5 by Colin Barker at Mon Aug 28 09:09:00 EDT 2017

STATUS

editing

proposed

#4 by Colin Barker at Mon Aug 28 08:56:40 EDT 2017

KEYWORD

nonn,changed,base

#3 by Colin Barker at Mon Aug 28 08:53:08 EDT 2017

NAME

allocated for Colin BarkerNumbers k such that 0 is the smallest decimal digit of k^2.

DATA

10, 20, 30, 32, 33, 40, 45, 47, 48, 49, 50, 51, 52, 53, 55, 60, 64, 70, 71, 78, 80, 84, 90, 95, 97, 98, 99, 100, 101, 102, 103, 104, 105, 110, 120, 130, 138, 140, 142, 143, 144, 145, 147, 148, 149, 150, 151, 152, 153, 155, 160, 170, 174, 175, 176, 179, 180

OFFSET

1,1

EXAMPLE

47 is in the sequence because 47^2 = 2209, the smallest decimal digit of which is 0.

PROG

(PARI) select(k->vecmin(digits(k^2))==0, vector(1000, k, k))

CROSSREFS

Cf. A291626, A291627, A291628, A291629, A291630, A291631.

KEYWORD

allocated

nonn

AUTHOR

Colin Barker, Aug 28 2017

STATUS

approved

editing

#2 by Colin Barker at Mon Aug 28 08:40:15 EDT 2017

KEYWORD

allocating

allocated

#1 by Colin Barker at Mon Aug 28 08:40:15 EDT 2017

NAME

allocated for Colin Barker

KEYWORD

allocating

STATUS

approved