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Search: id:A133973
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| A133973 |
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Home primes whose homeliness is greater than 9. |
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+0
13
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| 77773, 312619, 359929, 364627, 374531, 378997, 379811, 747521, 749711, 771941, 777643, 1173463, 1355021, 1389281, 1929311, 1991153, 2314723, 2315641, 2333797, 2336263, 2337397, 2337547, 2337607, 2337691, 2339929, 2373823, 2389853
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Number of terms < 10^n: 0, 0, 0, 0, 1, 11, 142, ....
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MATHEMATICA
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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}];
d = 10 - 2; lsu = {}; Do[ If[ lst[[n]] == lst[[n + d]], AppendTo[ lsu, lst[[n]] ]], {n, 188004 - d - 1}]; Take[ Union@ lsu, 30]
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CROSSREFS
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Cf. A037274, A118756, A133957, A133959, A133961, A133963, A133965, A133967, A133969, A133971, A133975, A133977, A133979.
Sequence in context: A069044 A087026 A133971 this_sequence A133974 A061528 A145553
Adjacent sequences: A133970 A133971 A133972 this_sequence A133974 A133975 A133976
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KEYWORD
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nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Sep 30 2007
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