|
| |
|
|
A132114
|
|
Multiply previous term by 7 and reverse.
|
|
8
|
|
|
|
1, 7, 94, 856, 2995, 56902, 413893, 1527982, 47859601, 702710533, 1373798194, 8537856169, 38139946795, 565726979662, 4367588800693, 15840612137503, 125269482488011, 770614773688678, 6470285143034935, 54544210069919254
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,2
|
|
|
LINKS
|
Vaclav Kotesovec, Table of n, a(n) for n = 1..1000
Vaclav Kotesovec, Plot of a(n)^(1/n) for n = 1..10000
|
|
|
FORMULA
|
a(n) = reverse(7 * a(n-1)) with a(1) = 1.
|
|
|
EXAMPLE
|
a(4) = reverse(7 * a(3)) = reverse(7 * reverse(7 * a(2))) = reverse(7 * reverse(7 * reverse(7 * a(1)))) = reverse(7 * reverse(7 * reverse(7))) = reverse(7*94) = 856.
|
|
|
PROG
|
(PARI) seq(n)={my(a=vector(n)); a[1]=1; for(n=2, #a, a[n]=fromdigits(Vecrev(digits(a[n-1]*7)))); a} \\ Andrew Howroyd, Jan 02 2020
(Magma) f:=func<n|Seqint(Reverse(Intseq(7*n)))>; a:=[1]; for n in [2..20] do Append(~a, f(a[n-1])); end for; a; // Marius A. Burtea, Jan 03 2020
|
|
|
CROSSREFS
|
Cf. A036447 (*2), A163632 (*3), A132064 (*4), A045539 (*5), A132078 (*6), A132113 (*8), A133361 (*9).
Sequence in context: A109304 A134113 A071584 * A221384 A243679 A360474
Adjacent sequences: A132111 A132112 A132113 * A132115 A132116 A132117
|
|
|
KEYWORD
|
base,nonn
|
|
|
AUTHOR
|
Rachit Agrawal (rachit_agrawal(AT)daiict.ac.in), Oct 31 2007
|
|
|
EXTENSIONS
|
Name edited by Andrew Howroyd, Jan 02 2020
|
|
|
STATUS
|
approved
|
| |
|
|
