The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A123872

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A123872

Start with the seed a(0)=2. The minimum number, different from 1, that multiplied by 2 (seed) produces a number with 2 as its rightmost digit is a(1)=6. Then 6*2=12. Again, the minimum number that multiplied by 12 produces 12 as its rightmost digits is a(2)=26 (12*26=312). And so on.
(history; published version)

#23 by Alois P. Heinz at Tue Aug 08 11:58:56 EDT 2023

STATUS

proposed

approved

#22 by Bert Dobbelaere at Tue Aug 08 08:20:09 EDT 2023

STATUS

editing

proposed

#21 by Bert Dobbelaere at Tue Aug 08 08:19:00 EDT 2023

DATA

2, 6, 26, 126, 6251, 62500001, 6250000000000001, 6250000000000000000000000000001, 62500000000000000000000000000000000000000000000000000000000001, 6250000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001

STATUS

proposed

editing

#20 by Michel Marcus at Tue Aug 08 07:14:50 EDT 2023

STATUS

editing

proposed

#19 by Michel Marcus at Tue Aug 08 07:14:46 EDT 2023

CROSSREFS

Cf. A123873-, A123874, A123875.

STATUS

proposed

editing

#18 by Bert Dobbelaere at Tue Aug 08 06:55:04 EDT 2023

STATUS

editing

proposed

#17 by Bert Dobbelaere at Tue Aug 08 06:52:26 EDT 2023

DATA

PROG

(Python)

import math

p, n = 2, 0

while n<10:

ndigits, oldp = len(str(p)), p

p += math.lcm(p, 10**ndigits)

print("a(%d) = %d"%(n:=n+1, p//oldp))

# Bert Dobbelaere, Aug 08 2023

KEYWORD

nonn,base,more

EXTENSIONS

More terms from Bert Dobbelaere, Aug 08 2023

STATUS

approved

editing

#16 by Bruno Berselli at Thu Sep 04 08:47:51 EDT 2014

STATUS

reviewed

approved

#15 by Michel Marcus at Thu Sep 04 08:24:49 EDT 2014

STATUS

proposed

reviewed

#14 by Paolo P. Lava at Thu Sep 04 08:10:49 EDT 2014

STATUS

editing

proposed