A058444 Squares composed of digits {0,4,9}, not ending with zero.

4, 9, 49, 9409, 44944, 994009, 9909904, 99940009, 404090404, 9999400009, 999994000009, 4004009004004, 9449494444009, 99999940000009, 9999999400000009, 40004000900040004, 999999994000000009, 99999999940000000009, 400004000090000400004, 9999999999400000000009

Offset

1,1

Comments

Includes all numbers of the form (10^k - 3)^2 for k >= 1 and of the form (2*100^k + 10^k + 2)^2 for k >= 1. - Andrew Howroyd, Oct 18 2024

Links

Zhao Hui Du, Table of n, a(n) for n = 1..54

Patrick De Geest, Index to related sequences

Hisanori Mishima, Sporadic tridigital solutions

Formula

a(n) = A058443(n)^2. - Andrew Howroyd, Oct 18 2024

Crossrefs

Cf. A058443.

Sequence in context: A028945 A086541 A053965 * A053925 A053943 A053955

Adjacent sequences: A058441 A058442 A058443 * A058445 A058446 A058447

Keyword

nonn,base

Author

Patrick De Geest, Nov 15 2000

Status

approved