The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A274978

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Integers of the form m*(m + 6)/7.
(history; published version)

#62 by Harvey P. Dale at Tue Sep 20 16:22:36 EDT 2022

STATUS

editing

approved

#61 by Harvey P. Dale at Tue Sep 20 16:22:33 EDT 2022

MATHEMATICA

Select[Table[(n(n+6))/7, {n, 0, 200}], IntegerQ] (* Harvey P. Dale, Sep 20 2022 *)

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approved

editing

#60 by Joerg Arndt at Mon Feb 28 04:13:33 EST 2022

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reviewed

approved

#59 by Michel Marcus at Mon Feb 28 02:43:07 EST 2022

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proposed

reviewed

#58 by Amiram Eldar at Mon Feb 28 02:33:45 EST 2022

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editing

proposed

#57 by Amiram Eldar at Mon Feb 28 02:28:08 EST 2022

PROG

(MAGMAMagma) [t: m in [0..200] | IsIntegral(t) where t is m*(m+6)/7];

#56 by Amiram Eldar at Mon Feb 28 02:27:19 EST 2022

FORMULA

Sum_{n>=2} 1/a(n) = (7 + 6*Pi*cot(Pi/7))/36. - Amiram Eldar, Feb 28 2022

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approved

editing

#55 by Susanna Cuyler at Sat Dec 19 08:37:49 EST 2020

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reviewed

approved

#54 by Michel Marcus at Sat Dec 19 01:22:55 EST 2020

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proposed

reviewed

#53 by Wesley Ivan Hurt at Fri Dec 18 20:29:17 EST 2020

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editing

proposed