|
0, 1, 2, 3, 4, 7, 8, 5, 6, 17, 16, 23, 64, 65, 10, 9, 32, 19, 128, 129, 512, 67, 256, 47, 24, 4097, 20, 4099, 32768, 79, 1024, 11, 18, 31, 14, 29, 4096, 2049, 66, 515, 514, 263, 65536, 2053, 8388608, 524289, 16384, 87, 16777216, 2097153, 70, 524291, 17179869184, 287, 524288, 1037, 8388610, 289, 134217728, 1071, 520, 97, 38, 15, 12, 257, 8192, 63
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,3
|
|
COMMENTS
|
Note the indexing: although the domain starts from 1, the range includes also zero.
|
|
LINKS
|
|
|
FORMULA
|
|
|
PROG
|
(PARI)
A005940(n) = { my(p=2, t=1); n--; until(!n\=2, if(n%2, t*=p, p=nextprime(p+1))); t };
A156552(n) = {my(f = factor(n), p, p2 = 1, res = 0); for(i = 1, #f~, p = 1 << (primepi(f[i, 1]) - 1); res += (p * p2 * (2^(f[i, 2]) - 1)); p2 <<= f[i, 2]); res}; \\ From A156552
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|