A037042 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A037042

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

16

0, 1, 45, 55, 99

(list; graph; refs; listen; history; text; internal format)

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

EXTENSIONS

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

STATUS

approved

NODES