|
Search: id:A077281
|
|
|
| A077281 |
|
Square root of sum of successive primes in n-th group in A077280. |
|
+0
4
|
| |
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
Partition of sequence of primes in groups such that sum of terms in each group is a square: {2-23}, {29-1021}, {1031-2179}, {2203-4051}, {4057-4153}, {4157-50377}, {50383-66643}, {66653-173647},{173651-?},...; A077280(n) gives the number of terms in n-th group; A077281(n)^2 gives the sum of terms in n-th group; A077282(n) gives the first term in n-th group; A077283(n) gives the last term in n-th group.
|
|
EXAMPLE
|
a(1)=10 because sum of first nine primes 2+...+23=100=10^2; a(2)=283 because sum of next 163 successive primes 29+...+1021=80089=283^2.
|
|
CROSSREFS
|
Cf. A077280, A077282, A077283.
Sequence in context: A165457 A025035 A012243 this_sequence A049387 A024295 A159960
Adjacent sequences: A077278 A077279 A077280 this_sequence A077282 A077283 A077284
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Zak Seidov (zakseidov(AT)yahoo.com), Nov 02 2002
|
|
|
Search completed in 0.002 seconds
|
