A255850 Number of digits in the n-th term of A061844: Squares which remain squares if you decrease every digit by 1.

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

Author

M. F. Hasler, Mar 10 2015

Keywords

• nonn
• base

Comments

Suggested by W. Appleby in a Number Theory discussion group, cf. link.

Links

• Lars Blomberg, Table of n, a(n) for n = 1..78
• G. Campbell et al., A six digit problem, Number Theory group on LinkedIn.com, March 2015.

Crossrefs

Cf. A061844, A055642, A255851.

Programs

PARI

a(n)=#Str(A061844(n)) \\ if A061844 is a function

PARI

A255850=apply(t->#Str(t),A061844) \\ if A061844 is a vector

Formula

a(n) = A055642(A061844(n)).

Extensions

More terms calculated from A061844 by Lars Blomberg, Aug 21 2016