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A255850
Number of digits in the n-th term of A061844: Squares which remain squares if you decrease every digit by 1.
2
1, 2, 4, 5, 7, 11, 12, 18, 20, 20, 20, 21, 30, 30, 30, 30, 30, 30, 30, 30, 32, 32, 32, 40, 42, 42, 42, 42, 42, 42, 42, 42, 42, 54, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60
OFFSET
1,2
COMMENTS
Suggested by W. Appleby in a Number Theory discussion group, cf. link.
LINKS
G. Campbell et al., A six digit problem, Number Theory group on LinkedIn.com, March 2015.
FORMULA
a(n) = A055642(A061844(n)).
PROG
(PARI) a(n)=#Str(A061844(n)) \\ if A061844 is a function
(PARI) A255850=apply(t->#Str(t), A061844) \\ if A061844 is a vector
CROSSREFS
KEYWORD
nonn,base
AUTHOR
M. F. Hasler, Mar 10 2015
EXTENSIONS
More terms calculated from A061844 by Lars Blomberg, Aug 21 2016
STATUS
approved