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 A300737 Numbers of the form (k*i + 1)*(k*j - 1) with i, j >= 1 and k >= 2. 1
 3, 5, 7, 8, 9, 11, 13, 14, 15, 17, 19, 20, 21, 23, 24, 25, 26, 27, 29, 31, 32, 33, 35, 37, 38, 39, 41, 43, 44, 45, 47, 48, 49, 50, 51, 53, 54, 55, 56, 57, 59, 61, 62, 63, 64, 65, 67, 68, 69, 71, 73, 74, 75, 77, 79, 80, 81, 83, 84, 85, 86, 87, 89, 90, 91, 92, 93, 95, 97, 98, 99, 101 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS PROG (PARI) limit=100; v=vector(limit); for(n=0, limit, for(k=2, floor(limit^(1/2)), for(i=1, limit/k, for(j=1, limit/k, if(n==(k*i+1)*(k*j-1), v[n]=1, ))))); for(n=1, limit, if(v[n], print1(n", "))) CROSSREFS Cf. A056868. Sequence in context: A060462 A072668 A249433 * A062958 A295075 A184996 Adjacent sequences:  A300734 A300735 A300736 * A300738 A300739 A300740 KEYWORD nonn AUTHOR Gionata Neri, Mar 11 2018 STATUS approved

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Last modified January 27 17:58 EST 2020. Contains 331296 sequences. (Running on oeis4.)