A082026 a(1)=5; a(n) is concatenation of squares of digits in a(n-1) (in base 10).

5, 25, 425, 16425, 13616425, 193613616425, 181936193613616425, 164181936181936193613616425, 13616164181936164181936181936193613616425, 19361361361616418193613616164181936164181936181936193613616425

Offset: 1

Author

Matthew Vandermast, Apr 01 2003

Keywords

• base
• easy
• nonn

Comments

If m is a member of the sequence represented by k digits in base 10, all members greater than m are congruent to m mod 10^k.

Examples

			The squares of the digits in the third term, 425, are 16, 4 and 25; hence a(4)=16425.
		

Links

• Paolo Xausa, Table of n, a(n) for n = 1..16

Crossrefs

Cf. A061588.

Programs

Mathematica

NestList[FromDigits[Flatten[IntegerDigits[IntegerDigits[#]^2]]] &, 5, 10] (* Paolo Xausa, Jan 10 2025 *)