A291626 - OEIS

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

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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)