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

1,1

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.

Links

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

Example

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

Mathematica

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

Crossrefs

Cf. A061588.

Sequence in context: A285602 A072324 A204544 * A101392 A078260 A007185

Adjacent sequences: A082023 A082024 A082025 * A082027 A082028 A082029

Keyword

base,easy,nonn,changed

Author

Matthew Vandermast, Apr 01 2003

Status

approved