In this paper, we study k-term arithmetic progressions N, N + d, ... , N + (k - 1)d of powerful numbers. Unconditionally, we exhibit infinitely many 3-term arithmetic progressions of powerful numbers with d & LE; 5N1/2. Assuming the abc-conjecture, we obtain a nearly tight lower bound on the common difference. We also prove some partial results when k > 4 and pose some open questions.
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Univ Witwatersrand, Sch Math, John Knopfmacher Ctr Applicable Anal & Number The, Private Bag 3, ZA-2050 Johannesburg, South AfricaUniv Witwatersrand, Sch Math, John Knopfmacher Ctr Applicable Anal & Number The, Private Bag 3, ZA-2050 Johannesburg, South Africa
Munagi, Augustine O.
Shonhiwa, Temba
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Univ Witwatersrand, Sch Math, John Knopfmacher Ctr Applicable Anal & Number The, Private Bag 3, ZA-2050 Johannesburg, South AfricaUniv Witwatersrand, Sch Math, John Knopfmacher Ctr Applicable Anal & Number The, Private Bag 3, ZA-2050 Johannesburg, South Africa
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Univ Memphis, Dept Math Sci, Memphis, TN 38152 USAUniv Memphis, Dept Math Sci, Memphis, TN 38152 USA
Balister, P.
Bollobas, B.
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Univ Memphis, Dept Math Sci, Memphis, TN 38152 USA
Dept Pure Math & Math Stat, Wilberforce Rd, Cambridge CB3 0WA, EnglandUniv Memphis, Dept Math Sci, Memphis, TN 38152 USA
Bollobas, B.
Morris, R.
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IMPA, Estr Dona Castorina 110, BR-22460320 Rio De Janeiro, BrazilUniv Memphis, Dept Math Sci, Memphis, TN 38152 USA
Morris, R.
Sahasrabudhe, J.
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IMPA, Estr Dona Castorina 110, BR-22460320 Rio De Janeiro, Brazil
Univ Cambridge, Peterhouse,Trumpington St, Cambridge CB2 1RD, EnglandUniv Memphis, Dept Math Sci, Memphis, TN 38152 USA
Sahasrabudhe, J.
Tiba, M.
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Dept Pure Math & Math Stat, Wilberforce Rd, Cambridge CB3 0WA, EnglandUniv Memphis, Dept Math Sci, Memphis, TN 38152 USA
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Qinghai Normal Univ, Sch Math & Stat, Xining 810008, Qinghai, Peoples R ChinaQinghai Normal Univ, Sch Math & Stat, Xining 810008, Qinghai, Peoples R China
Mao, Yaping
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Ozeki, Kenta
Robertson, Aaron
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Colgate Univ, Dept Math, Hamilton, NY 13346 USAQinghai Normal Univ, Sch Math & Stat, Xining 810008, Qinghai, Peoples R China
Robertson, Aaron
Wang, Zhao
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China Jiliang Univ, Coll Sci, Hangzhou 310018, Peoples R ChinaQinghai Normal Univ, Sch Math & Stat, Xining 810008, Qinghai, Peoples R China