A291630 Numbers k such that 5 is the smallest decimal digit of k^2.

24, 76, 87, 236, 314, 316, 766, 816, 834, 2366, 2383, 2387, 2424, 2563, 2626, 2976, 7613, 7666, 8117, 8184, 8234, 8286, 8366, 8716, 8814, 9266, 9316, 9363, 9474, 9786, 9837, 23634, 23784, 23866, 23874, 24474, 25663, 25684, 26076, 26187, 26374, 26417, 27687

Offset

1,1

Links

Chai Wah Wu, Table of n, a(n) for n = 1..10000

Example

87 is in the sequence because 87^2 = 7569, the smallest decimal digit of which is 5.

Mathematica

Select[Range[30000], Min[IntegerDigits[#^2]]==5&] (* Harvey P. Dale, Nov 03 2023 *)

Prog

(PARI) select(k->vecmin(digits(k^2))==5, vector(30000, k, k))
(Python)
A291630_list = [k for k in range(1, 10**6) if min(str(k**2)) == '5'] # Chai Wah Wu, Aug 28 2017

Crossrefs

Cf. A291625, A291626, A291627, A291628, A291629, A291631.

Sequence in context: A265424 A033572 A233883 * A195027 A325958 A211574

Adjacent sequences: A291627 A291628 A291629 * A291631 A291632 A291633

Keyword

nonn,base

Author

Colin Barker, Aug 28 2017

Status

approved