A071584 Powers of 7 written backwards.

1, 7, 94, 343, 1042, 70861, 946711, 345328, 1084675, 70635304, 942574282, 3476237791, 10278214831, 70401098869, 948270322876, 3499051657474, 10696503923233, 702789315036232, 9440197953148261, 34137358159889311

Offset

0,2

Links

Alois P. Heinz, Table of n, a(n) for n = 0..1000

Maple

a:= n-> (s-> parse(cat(s[-i]$i=1..length(s))))(""||(7^n)):
seq(a(n), n=0..50);  # Alois P. Heinz, Apr 09 2015

Mathematica

FromDigits[Reverse[IntegerDigits[#]]]&/@(7^Range[0, 20]) (* Harvey P. Dale, Apr 29 2012 *)

Prog

(PARI) for(i=1, 50, n=5^i; s=ceil(log(n)/log(10)); print1(sum(i=0, s, 10^(s-i-1)*(floor(n/10^i)-10*floor(n/10^(i+1)))), ", "))

Crossrefs

Sequence in context: A220405 A109304 A134113 * A132114 A221384 A243679

Adjacent sequences: A071581 A071582 A071583 * A071585 A071586 A071587

Keyword

easy,nonn,base

Author

Benoit Cloitre, Jun 01 2002

Status

approved