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A073682
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Prime sum of n-th group of successive primes in A073684.
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5
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5, 23, 101, 109, 263, 211, 251, 757, 1367, 941, 2053, 1901, 911, 2347, 1861, 1187, 1249, 1303, 2273, 1433, 1493, 1553, 2777, 2927, 44843, 26699, 65713, 4597, 14159, 8069, 18439, 5197, 8819, 9011, 9277, 9419, 33599, 53381, 6761, 6823, 11497, 7013
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Partition the sequence of primes into groups so that the sum of the terms in each group is prime: {2, 3}, {5, 7, 11}, {13, 17, 19, 23, 29}, {31, 37, 41}, {43, 47, 53, 59, 61}, {67, 71, 73}, {79, 83, 89}, {97, 101, 103, 107, 109, 113, 127}, {131, 137, 139, 149, 151, 157, 163, 167, 173}, {179, 181, 191, 193, 197},..; A073684(n) is the number of terms in n-th group; A073682(n) is the sum of terms in n-th group; A073683(n) is the first term in n-th group; A077279(n) is the last term in n-th group.
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LINKS
| Zak Seidov, Table of n,a(n) for n=1..3000
Moshe Levin, Table of n, A073682(n), A073683(n), A073684(n), A077279(n) for n=1..3000
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EXAMPLE
| a(1)=5 because sum of first two primes 2+3=5 is prime; a(2)=23 because sum of next three primes 5+7+11=23 is prime; a(3)=101 because sum of next five primes 13+17+19+23+29=101 is prime.
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CROSSREFS
| Cf. A073683, A073684, A077279.
Sequence in context: A196489 A049674 A077277 * A034958 A085350 A113443
Adjacent sequences: A073679 A073680 A073681 * A073683 A073684 A073685
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KEYWORD
| nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Aug 11 2002
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EXTENSIONS
| More terms from Gabriel Cunningham (gcasey(AT)mit.edu), Apr 10 2003
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