A037042 2-White numbers (take power 2, sum 2-digit groups to get same number).

0, 1, 45, 55, 99

Offset

1,3

Comments

Also, apart from initial 0, the full list of 2-Kaprekar numbers.

References

Italo Ghersi, Matematica dilettevole e curiosa, p. 190, Hoepli, Milano, 1967. [Vincenzo Librandi, Apr 22 2010]

Links

Table of n, a(n) for n=1..5.

D. E. Iannucci, The Kaprekar numbers, J. Integer Sequences, Vol. 3, 2000, #1.2.

Index entries for Colombian or self numbers and related sequences

Example

45 is a 2-White number since 45^2 = 2025 and 20 + 25 = 45.

Crossrefs

Sequence in context: A167328 A116247 A168108 * A119208 A068812 A119071

Adjacent sequences: A037039 A037040 A037041 * A037043 A037044 A037045

Keyword

full,nonn,fini,base

Author

Erich Friedman

Extensions

Offset set to 1 by Paolo P. Lava, Jul 12 2016

Status

approved