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A031128 Number of proper factorizations of p1^n*p2^5, where p1 and p2 are distinct primes. 0
6, 18, 46, 96, 188, 338, 588, 974, 1575, 2471, 3803, 5726, 8497, 12399, 17873, 25432, 35817, 49907, 68938, 94377, 128233, 172916, 231629, 308239, 407803, 536411, 701909, 913772, 1184021, 1527164, 1961431, 2508761, 3196472 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,1
LINKS
FORMULA
a(n) = A000491(n) - 1 = A028422(2^n*3^5). - Ray Chandler, May 01 2017
CROSSREFS
Sequence in context: A095170 A261647 A305031 * A304161 A261016 A328890
KEYWORD
nonn
AUTHOR
EXTENSIONS
Offset changed to 0, a(13)=12399 corrected and more terms added by Ray Chandler, May 01 2017
STATUS
approved

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Last modified March 2 17:33 EST 2024. Contains 370498 sequences. (Running on oeis4.)