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 A357772 #24 Oct 13 2022 11:36:54 %S A357772 29,38,47,49,56,58,65,67,74,76,83,85,89,92,94,98,119,128,137,139,146, %T A357772 148,155,157,164,166,173,175,179,182,184,188,191,193,197,199,209,218, %U A357772 227,229,236,238,245,247,254,256,263 %N A357772 Numbers with a sum of digits which is not 7-smooth. %F A357772 a(n) ~ n. %e A357772 2 + 9 = 11 which is not of the form 2^a*3^b*5^c*7^d, so 29 is in the sequence. %o A357772 (PARI) smooth(n,s)=forprime(p=2,s,n/=p^valuation(n,p)); n==1 %o A357772 is(n)=!smooth(sumdigits(n),7) %Y A357772 Cf. A087144. %K A357772 nonn,easy,base %O A357772 1,1 %A A357772 _Charles R Greathouse IV_, Oct 13 2022