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Search: id:A102070
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| A102070 |
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Numbers that can be expressed as p+p^n (p prime, n >= 0) in more than one way. |
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+0
2
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| 4, 6, 10, 12, 14, 18, 30, 34, 38, 62, 74, 84, 130, 132, 158, 182, 194, 258, 278, 314, 350, 380, 398, 422, 458, 514, 542, 614, 662, 674, 734, 758, 878, 992, 998, 1094, 1154, 1202, 1214, 1238, 1322, 1382, 1454, 1622, 1658, 1722, 1754, 1874, 1934, 1994, 2018, 2138
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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14 = 7+7^1 = 13+13^0. 130 = 2+2^7 = 5+5^3.
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PROGRAM
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(PARI) v = vector(20000); count = 0; i = 1; p = 2; while (p < 5000, pow = 1; while (pow < 5000, n = p + pow; count++; v[count] = n; pow *= p); i++; p = prime(i)); w = vector(count, x, v[x]); v = vecsort(w); i = 3; for (j = 2, count, if (v[j] == v[j - 1] && v[j] != v[j - 2], print(v[j])));
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CROSSREFS
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Sequence in context: A137230 A134333 A114331 this_sequence A026402 A036438 A066190
Adjacent sequences: A102067 A102068 A102069 this_sequence A102071 A102072 A102073
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KEYWORD
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easy,nonn
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AUTHOR
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David Wasserman (wasserma(AT)spawar.navy.mil), Dec 28 2004
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