This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A284068 #12 Sep 08 2022 08:46:19 %S A284068 7,77,78,79,87,97,777,778,779,787,788,789,797,798,799,877,878,879,887, %T A284068 897,977,978,979,987,997,7777,7778,7779,7787,7788,7789,7797,7798,7799, %U A284068 7877,7878,7879,7887,7888,7889,7897,7898,7899,7977,7978,7979,7987,7988,7989 %N A284068 Numbers whose smallest decimal digit is 7. %C A284068 Numbers n such that A054054(n) = 7. %C A284068 Prime terms are in A106107. %t A284068 Select[Range[8000], Min[IntegerDigits[#]] == 7 &] (* _Giovanni Resta_, Mar 23 2017 *) %o A284068 (Magma) [n: n in [1..100000] | Minimum(Setseq(Set(Sort(&cat[Intseq(n)])))) eq 7] %o A284068 (PARI) isok(n) = vecmin(digits(n)) == 7; \\ _Michel Marcus_, Mar 25 2017 %Y A284068 Cf. Sequences of numbers whose smallest decimal digit is k (for k = 0..9): A011540 (k = 0), A284062 (k = 1), A284063 (k = 2), A284064 (k = 3), A284065 (k = 4), A284066 (k = 5), A284067 (k = 6), this sequence (k = 7), A284069 (k = 8), A002283 (k = 9). %K A284068 nonn,base %O A284068 1,1 %A A284068 _Jaroslav Krizek_, Mar 23 2017