OFFSET
1,2
EXAMPLE
2^201 begins "32138760885...". Since it starts with a run of 3 consecutive decreasing digits and 201 is the smallest power to have this property, a(3) = 201.
PROG
(Python)
def a(n):
for k in range(1, 10**5):
st = str(2**k)
count = 0
if len(st) > n:
for i in range(len(st)):
if int(st[i]) == int(st[i+1])+1:
count += 1
else:
break
if count == n:
return k
n = 0
while n < 10:
print(a(n), end=', ')
n += 1
CROSSREFS
KEYWORD
nonn,base,fini,full
AUTHOR
Derek Orr, Jul 07 2014
EXTENSIONS
a(7)-a(10) from Hiroaki Yamanouchi, Jul 10 2014
STATUS
approved
