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 A072849 Prime(n)+...+prime(n+3) is a square = A051395(n)^2. 1
 3, 21, 33, 84, 104, 199, 689, 1848, 1923, 3435, 3795, 3985, 4126, 4742, 5968, 6413, 6495, 7649, 8927, 9906, 16885, 17677, 20474, 20996, 22924, 23923, 36902, 38733, 40347, 40654, 41956, 42601, 43047, 44482, 44920, 51608, 52305, 56706, 66032 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS EXAMPLE a(1)=3 because prime(3)+prime(4)+prime(5)+prime(6)=5+7+11+13=6*6. PROG (PARI) lista(m) = {for (n = 1, m, if (issquare(prime(n) + prime(n+1) + prime(n+2) + prime(n+3)), print1(n, ", ")); ); }  \\ Michel Marcus, Apr 19 2013 CROSSREFS Cf. A051395. Sequence in context: A045802 A006133 A039766 * A089323 A100986 A213141 Adjacent sequences:  A072846 A072847 A072848 * A072850 A072851 A072852 KEYWORD easy,nonn AUTHOR Zak Seidov, Jun 21 2003 STATUS approved

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