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A256365 Numbers that are multiple-digit narcissistic numbers in exactly six bases. 7

%I #20 Feb 18 2021 00:20:21

%S 36125,190125,444925

%N Numbers that are multiple-digit narcissistic numbers in exactly six bases.

%H W. Schneider, <a href="http://web.archive.org/web/20050213060737/http://www.wschnei.de/digit-related-numbers/pdi.html">Perfect Digital Invariants: Pluperfect Digital Invariants(PPDIs)</a>

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/NarcissisticNumber.html">Narcissistic Number</a>

%H Wikipedia, <a href="http://en.wikipedia.org/wiki/Narcissistic_number">Narcissistic number</a>

%e a(1) = 36125 because this is the first number that is a multiple-digit narcissistic number in exactly six bases (193, 212, 327, 423, 1057 and 7187).

%o (PARI) for(n=3, 1000000, k=0; for(z=2, n, y=n; j=0; L=List(); until(y==0, x=y%z; j++; listinsert(L, x, j); while(!((y%z)==0), y--); y=y/z); t=0; for(p=1, j, t+=L[p]^j); if(n==t, k++)); if(k==6, print1(n, ", ")))

%Y Cf. A005188.

%Y Cf. A256359 (every number of bases).

%Y Cf. A256360, A256361, A256362, A256363, A256364 (1 to 5 bases).

%Y Cf. A256459 (first occurrences).

%K nonn,base,bref,more

%O 1,1

%A _Tim Johannes Ohrtmann_, Mar 30 2015

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