Voozh

A137116

Numbers k such that k and k^2 use only the digits 2, 5, 7, 8 and 9.

5, 27, 77, 85, 527, 727, 7227, 9777, 28277, 29585, 88277, 99277, 278527, 298827, 2788527, 2789227, 5289227, 8875727, 9889277, 22925527, 27797977, 29879585, 52898827, 85298827, 88875527, 99789227, 99988777, 278889277, 287279585, 292898827, 297875527, 299929585, 527252527, 528982977, 727528527, 727825527, 727925527, 988579585, 992587527

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

OFFSET

1,1

COMMENTS

Generated with DrScheme.

LINKS

Michael S. Branicky, Table of n, a(n) for n = 1..578 (through 20 digits; first 180 terms from Jonathan Wellons)

Jonathan Wellons, Tables of Shared Digits [archived].

EXAMPLE

727872928279585^2 = 529798999722297889227927772225.

PROG

(Python) # uses auptod in A137110