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1, 4, 8, 10, 16, 19, 27, 31, 40, 45, 57, 63, 77, 84, 99, 107, 125, 134, 154, 164, 185, 196, 220, 232, 257, 270, 297, 311, 341, 356, 388, 404, 437, 454, 489, 507, 545, 564, 603, 623, 665, 686, 730, 752, 797, 820, 868, 892, 941, 966, 1017, 1043, 1097, 1124, 1179
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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LINKS
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FORMULA
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seq = if n even then n/2 else n. seq = if n is prime then n+1. Sumseq = Sumseq + seq for n=1, 2, ...
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PROG
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(PARI) a(n)={sum(k=1, n, if(isprime(k), k+1, if(k%2, k, k/2)))};
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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