|
| |
|
|
A120492
|
|
1 + Sum[ Prime[k]^(n-1), {k,1,n}].
|
|
4
| |
|
|
2, 6, 39, 504, 17765, 552552, 30870007, 1387350084, 103306557609, 16762578985600, 1290073179870299, 216632259853089564, 30312656885388018973, 2922170957243151047352, 378560698729260507690687
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
COMMENTS
| Prime p divides a(p). n divides a(n) for n={1,2,3,4,5,6,7,9,10,11,12,13,17,19,22,23,29,31,37,41,43,45,47,...}.
|
|
|
FORMULA
| a(n) = 1 + Sum[ Prime[k]^(n-1), {k,1,n}].
|
|
|
MATHEMATICA
| Table[1+Sum[Prime[k]^(n-1), {k, 1, n}], {n, 1, 20}]
|
|
|
CROSSREFS
| Sequence in context: A118324 A060421 A054970 * A028300 A068207 A027161
Adjacent sequences: A120489 A120490 A120491 * A120493 A120494 A120495
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Alexander Adamchuk (alex(AT)kolmogorov.com), Aug 04 2006
|
| |
|
|
