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 A218248 Recurring digital invariants of order 7. 3
 80441, 86874, 253074, 376762, 922428, 982108, 1152428, 2191663, 2755907, 2767918, 8139850 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Eric Weisstein's World of Mathematics, Recurring Digital Invariant EXAMPLE 2755907: 2^7 + 7^7 + 5^7 + 5^7 + 9^7 + 0^7 + 7^7 = 6586433 6586433: 6^7 + 5^7 + 8^7 + 6^7 + 4^7 + 3^7 + 3^7 = 2755907, so 2755907 is an order 7 recurring digital invariant. MATHEMATICA lst = {}; f[n_] := Total[IntegerDigits[n]^7]; Do[a = n; Do[a = f[a]; If[a < n, Break[]]; If[a == n && ! n == f[n], AppendTo[lst, n]; Break[]], {92}], {n, 10^7}]; lst CROSSREFS Cf. A218161, A218246-A218247. Sequence in context: A250080 A251377 A204051 * A102457 A102459 A329188 Adjacent sequences:  A218245 A218246 A218247 * A218249 A218250 A218251 KEYWORD base,fini,full,nonn AUTHOR Arkadiusz Wesolowski, Oct 24 2012 STATUS approved

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Last modified June 19 12:12 EDT 2021. Contains 345128 sequences. (Running on oeis4.)