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29, 127, 449, 571, 727, 1721, 4027, 11969, 16987, 18913, 26449, 37139, 43609, 48871, 48953, 63799, 64781, 114479, 180847, 220021, 400031, 400597, 476911, 607549, 679969, 705883, 706841, 770059, 776449, 807539, 912367, 932177, 964793, 1007959, 1052237, 1095851, 1356227, 1444567, 1573339, 1664633
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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EXAMPLE
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a(3) = 449 is a term because it is prime and A001414(450) = 18 = A001414(448) - 1.
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MAPLE
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spf:= proc(n) local t; add(t[1]*t[2], t=ifactors(n)[2]) end proc:
select(p -> spf(p+1)=spf(p-1)-1, [seq(ithprime(i), i=1..10^5)]);
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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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