A291626 Numbers k such that 1 is the smallest decimal digit of k^2.

1, 4, 9, 11, 12, 13, 14, 19, 21, 29, 31, 34, 35, 36, 37, 38, 39, 41, 42, 43, 44, 46, 54, 56, 59, 61, 69, 72, 79, 81, 89, 91, 96, 106, 107, 108, 109, 111, 112, 113, 114, 115, 116, 117, 118, 119, 121, 122, 123, 124, 125, 126, 127, 128, 129, 131, 132, 133, 134

Offset

1,2

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Example

29 is in the sequence because 29^2 = 841, the smallest decimal digit of which is 1.

Mathematica

Select[Range[200], Min[IntegerDigits[#^2]]==1&] (* Harvey P. Dale, Sep 07 2019 *)

Prog

(PARI) select(k->vecmin(digits(k^2))==1, vector(1000, k, k))
(Python)
A291626_list = [k for k in range(1, 10**6) if min(str(k**2)) == '1'] # Chai Wah Wu, Aug 28 2017

Crossrefs

Cf. A291625, A291627, A291628, A291629, A291630, A291631.

Sequence in context: A115668 A055675 A000974 * A376591 A312833 A243651

Adjacent sequences: A291623 A291624 A291625 * A291627 A291628 A291629

Keyword

nonn,base

Author

Colin Barker, Aug 28 2017

Status

approved