OFFSET
1,1
COMMENTS
Does a(n) ~ n? - David A. Corneth, Feb 28 2021
LINKS
David A. Corneth, Table of n, a(n) for n = 1..10000
David A. Corneth, PARI program
EXAMPLE
2^105 = 40(5648192073)03340847894502572032.
PROG
(PARI) See PARI link \\ David A. Corneth, Feb 28 2021
(Python)
def haspan(s): return any(len(set(s[i:i+10]))==10 for i in range(len(s)-9))
print([m for m in range(1065) if haspan(str(2**m))]) # Michael S. Branicky, Feb 28 2021
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Feb 06 2006
STATUS
approved