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A038211 Can express a(n) with the digits of a(n)^4 in order, only adding plus signs. 1
0, 1, 7, 10, 19, 22, 25, 27, 28, 34, 36, 37, 45, 52, 54, 55, 58, 61, 63, 64, 67, 72, 73, 76, 79, 81, 82, 85, 91, 100, 103, 106, 108, 109, 112, 115, 117, 118, 121, 124, 127, 133, 135, 142, 144, 145, 148, 153, 154, 157, 162, 163, 166, 169, 172, 175, 178, 180, 181 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

All terms == 0, 1, 4 or 7 (mod 9). - Robert Israel, Sep 06 2020

LINKS

David A. Corneth, Table of n, a(n) for n = 1..10000 (first 5000 terms from Robert Israel)

EXAMPLE

a(6)=22 is in the sequence because 22^4=234256 and 2+3+4+2+5+6=22.

a(8)=27 is in the sequence because 27^4=531441 and 5+3+14+4+1=27.

MAPLE

F:= proc(n, t) local d; option remember;

   if n = t then return true fi;

   if n < t then return false fi;

   for d from 1 to min(ilog10(t)+1, ilog10(n)+1) do

     if procname(floor(n/10^d), t - (n mod 10^d)) then return true fi

   od;

   false

end proc:

select(t -> F(t^4, t), [$0..1000]); # Robert Israel, Sep 06 2020

CROSSREFS

Cf. A001477, A038206, A038209.

Sequence in context: A155027 A118420 A196939 * A122226 A240791 A064210

Adjacent sequences:  A038208 A038209 A038210 * A038212 A038213 A038214

KEYWORD

nonn,base

AUTHOR

Erich Friedman

EXTENSIONS

Offset changed by Robert Israel, Sep 06 2020

STATUS

approved

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Last modified September 27 10:28 EDT 2021. Contains 347689 sequences. (Running on oeis4.)