OFFSET
1,2
LINKS
Michael S. Branicky, Table of n, a(n) for n = 1..369
FORMULA
a(n) = numerator(Sum_{k=1..n} k/10^A058183(k)). - Stefano Spezia, Nov 30 2022. (This is simply a restatement of the definition.)
EXAMPLE
a(4) = 617 = smallest integer multiple of 0.1234, 617 = 5000*(0.1234).
PROG
(PARI) a(n) = {my(s = ""); for (k=1, n, s = concat(s, Str(k))); numerator(eval(s)/10^(#s)); } \\ Michel Marcus, Jan 15 2019
(Python)
from itertools import count, islice
def agen(): # generator of terms
num, den, pow = 0, 1, 0
for n in count(1):
sn = str(n)
num = num*10**len(sn) + n
den *= 10**len(sn)
pow += len(sn)
nr, c2, c5 = num, pow, pow
while nr%2 == 0 and c2 > 0: nr //= 2; c2 -= 1
while nr%5 == 0 and c5 > 0: nr //= 5; c5 -= 1
yield nr
print(list(islice(agen(), 19))) # Michael S. Branicky, Nov 30 2022
CROSSREFS
KEYWORD
base,nonn,frac
AUTHOR
Amarnath Murthy, Nov 24 2002
EXTENSIONS
More terms from Sascha Kurz, Jan 04 2003
More terms from Michel Marcus, Jan 15 2019
STATUS
approved