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Revision History for A179646

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A179646

Product of the 5th power of a prime and different distinct prime of the 2nd power (p^5*q^2).
(history; published version)

#22 by Michel Marcus at Mon Jul 06 02:38:35 EDT 2020

STATUS

editing

approved

#21 by Michel Marcus at Mon Jul 06 02:38:15 EDT 2020

FORMULA

Sum_{n>=1} 1/a(n) = P(2)*P(5) - P(7) = A085548 * A085965 - A085967 = 0.007886..., where P is the prime zeta function. - Amiram Eldar, Jul 06 2020

STATUS

reviewed

editing

#20 by Joerg Arndt at Mon Jul 06 02:33:43 EDT 2020

STATUS

proposed

reviewed

#19 by Amiram Eldar at Mon Jul 06 02:11:35 EDT 2020

STATUS

editing

proposed

#18 by Amiram Eldar at Mon Jul 06 02:01:42 EDT 2020

FORMULA

Sum_{n>=1} 1/a(n) = P(2)*P(5) - P(7) = A085548 * A085965 - A085967 = 0.007886..., where P is the prime zeta function. - Amiram Eldar, Jul 06 2020

CROSSREFS

Cf. A085548, A085965, A085967.

STATUS

approved

editing

#17 by R. J. Mathar at Sat May 20 10:57:26 EDT 2017

STATUS

editing

approved

#16 by R. J. Mathar at Sat May 20 10:57:20 EDT 2017

LINKS

<a href="/index/Pri#prime_signature">Index to sequences related to prime signature</a>

STATUS

approved

editing

#15 by Charles R Greathouse IV at Mon May 13 01:49:24 EDT 2013

PROG

(PARI) list(lim)=my(v=List(), t); forprime(p=2, (lim\4)^(1/5), t=p^5; forprime(q=2, sqrt(lim\t), if(p==q, next); listput(v, t*q^2))); vecsort(Vec(v)) \\ _Charles R Greathouse IV, _, Jul 20 2011

Discussion

Mon May 13

01:49

OEIS Server: https://oeis.org/edit/global/1914

#14 by Bruno Berselli at Thu Mar 14 11:34:10 EDT 2013

STATUS

proposed

approved

#13 by Paolo P. Lava at Thu Mar 14 10:24:49 EDT 2013

STATUS

editing

proposed