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A133975 Home primes whose homeliness is greater than 10. 12

%I #5 Apr 28 2015 15:01:20

%S 378997,379811,747521,777643,1173463,2314723,2315641,2333797,2337397,

%T 2337607,2337691,3127979,3127997,3136607,3173761,3182561,3371237,

%U 3372371,3373547,3373907,3374729,3376991,3377999,3378317,3379829

%N Home primes whose homeliness is greater than 10.

%C Number of terms < 10^n: 0, 0, 0, 0, 0, 4, 60, ....

%t lst = {}; f[n_] := FromDigits@ Flatten[ IntegerDigits@ Table[ #[[1]], {#[[2]]}] & /@ FactorInteger@n, 2]; h[n_] := NestWhileList[f@# &, n, !PrimeQ@# &, 1, 28]; Do[p = h[n][[ -1]]; If[ PrimeQ@p && p < 10^7 && p != n, Print[{n, p}]; AppendTo[lst, p]], {n, 2, 1000}];

%t d = 11 - 2; lsu = {}; Do[ If[ lst[[n]] == lst[[n + d]], AppendTo[ lsu, lst[[n]] ]], {n, 188004 - d - 1}]; Take[ Union@ lsu, 30]

%Y Cf. A037274, A118756, A133957, A133959, A133961, A133963, A133965, A133967, A133969, A133971, A133973, A133977, A133979.

%K nonn,base

%O 1,1

%A _Robert G. Wilson v_, Sep 30 2007

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Last modified April 24 12:31 EDT 2024. Contains 371937 sequences. (Running on oeis4.)