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 A357670 Sliding numbers which are products of three distinct primes. 0
 70, 110, 290, 1001, 1010, 1258, 3157, 3445, 5002, 6266, 6410, 50002, 1958245, 2000005, 9766649, 9775865, 20000005, 48830173, 200000005, 488283298, 2000000005, 2441410346, 6103679465, 10000000001, 12207039442, 30517905805, 50000000002, 61035172634, 152588545985, 200000000005, 305175814018 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A squarefree subsequence of numbers of the form p + q where 1/p + 1/q = (p + q)/10^k for some k >= 1. LINKS Table of n, a(n) for n=1..31. EXAMPLE 70 = 2*5*7 (70 = 20 + 50 and 1/20 + 1/50 = 0.070). 1001 = 7*11*13 (1001 = 1 + 1000 and 1/1 + 1/1000 = 1.001). 9766649 = 29*61*5521 (9766649 = 1024 + 9765625 and 1/1024 + 1/9765625 = 0.0009766649). 200000005 = 5*53*754717 (200000005 = 5 + 200000000 and 1/5 + 1/200000000 = 0.200000005). CROSSREFS Intersection of A103182 and A007304. Sequence in context: A044002 A117350 A004239 * A185817 A260573 A224672 Adjacent sequences: A357667 A357668 A357669 * A357671 A357672 A357673 KEYWORD nonn,base AUTHOR Massimo Kofler, Oct 08 2022 EXTENSIONS More terms from Hugo Pfoertner, Oct 08 2022 STATUS approved

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Last modified May 23 18:34 EDT 2024. Contains 372765 sequences. (Running on oeis4.)