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A286624
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a(n) = (prime(1+n)*prime(n)) + prime(n) + 1.
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7
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9, 19, 41, 85, 155, 235, 341, 457, 691, 929, 1179, 1555, 1805, 2065, 2539, 3181, 3659, 4149, 4825, 5255, 5841, 6637, 7471, 8723, 9895, 10505, 11125, 11771, 12427, 14465, 16765, 18079, 19181, 20851, 22649, 23859, 25749, 27385, 29059, 31141, 32579, 34753, 37055, 38215, 39401, 42189, 47265, 50845, 52211
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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9 is the only perfect square in this sequence. - Altug Alkan, Jul 01 2017
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LINKS
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FORMULA
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MATHEMATICA
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Array[(#1 #2) + #1 + 1 & @@ Prime[# + {0, 1}] &, 49] (* Michael De Vlieger, Mar 14 2021 *)
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PROG
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(Scheme)
(PARI) lista(nn) = forprime(p=2, nn, print1(p*(nextprime(p+1)+1)+1, ", ")); \\ Altug Alkan, Jul 01 2017
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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