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Search: id:A133963
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| A133963 |
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Home primes whose homeliness is greater than 4. |
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+0
13
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| 773, 1129, 3137, 3251, 3389, 3593, 3761, 3797, 7541, 7853, 13367, 23167, 23251, 23557, 23719, 23743, 23761, 23773, 23929, 23971, 31193, 31397, 31973, 33191, 33331, 33769, 33797, 33863, 36389, 37199, 37307, 37463, 37547, 37573, 37607
(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, 1, 10, 75, 758, 5994, ....
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EXAMPLE
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(10, 25, 55, 511, 773) -> 773, etc.
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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 = 4 - 2; lsu = {}; Do[ If[ lst[[n]] == lst[[n + d]], AppendTo[ lsu, lst[[n]] ]], {n, 188004 - d - 1}]; Take[ Union@ lsu, 40]
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CROSSREFS
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Cf. A037274, A118756, A133957, A133959, A133961, A133965, A133967, A133969, A133971, A133973, A133975, A133977, A133979.
Sequence in context: A013542 A045078 A114543 this_sequence A133964 A033919 A055521
Adjacent sequences: A133960 A133961 A133962 this_sequence A133964 A133965 A133966
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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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