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Search: id:A006146
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| A006146 |
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Sums of prime divisors of Ruth-Aaron numbers. |
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+0
4
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| 5, 5, 7, 18, 15, 20, 44, 46, 29, 31, 50, 30, 20, 34, 75, 162, 146, 46, 14, 113, 53, 66, 333, 36, 514, 318, 43, 193, 279, 418, 30, 121, 55, 485, 200, 136, 77, 37, 211, 587
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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Science, vol. 275, p. 759, 1997.
John L. Drost, Ruth/Aaron Pairs, J. Recreational Math. 28 (No. 2), 120-122.
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LINKS
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Ivars Petersen's page
Eric Weisstein's World of Mathematics, Ruth-Aaron Pair
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MAPLE
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with(numtheory): for n from 1 to 10000 do t0 := 0; t1 := factorset(n);
for j from 1 to nops(t1) do t0 := t0+t1[ j ]; od: s[ n ] := t0; od:
for n from 1 to 9999 do if s[ n ] = s[ n+1 ] then lprint(n, s[ n ]); fi; od:
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CROSSREFS
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Cf. A006145, A039752, A039753, A039703, A054378.
Adjacent sequences: A006143 A006144 A006145 this_sequence A006147 A006148 A006149
Sequence in context: A088047 A109257 A088048 this_sequence A077956 A077977 A019204
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KEYWORD
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nonn
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AUTHOR
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njas
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