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A156833 A054525 * A156348 * [1,2,3,...] 5
1, 2, 3, 6, 5, 16, 7, 24, 24, 38, 11, 103, 13, 68, 127, 144, 17, 261, 19, 404, 291, 152, 23, 994, 370, 206, 540, 1093, 29, 2195, 31, 1584, 943, 338, 2543, 4808, 37, 416, 1479, 7371, 41, 7929, 43, 4691, 8976, 596, 47, 18876, 6510, 11035, 3091 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Conjecture: for n>1, a(n) = n iff n is prime.

Companion to A156834: (1, 2, 3, 5, 5, 12, 7, 17, 19,...).

LINKS

Table of n, a(n) for n=1..51.

FORMULA

A054525 * A156348 * [1,2,3,...]

EXAMPLE

a(4) = 6 since first 4 terms of A156348 * [1, 2, 3, 4,...] = (1, 3, 4, 9);

Then (1, 3, 4, 9) dot (0, -1, 0, 1) = (0 - 3 + 0 + 9) = 6. Row 4 of A054525 = (0, -1, 0, 1).

MAPLE

A156833T := proc(n, k)

    add(A054525(n, j)*A156348(j, k), j=k..n) ;

end proc:

A156833 := proc(n)

    add(A156833T(n, k)*k, k=1..n) ;

end proc: # R. J. Mathar, Mar 03 2013

CROSSREFS

Cf. A156348, A054525, A156834

Sequence in context: A098012 A066117 A222311 * A319344 A260443 A206242

Adjacent sequences:  A156830 A156831 A156832 * A156834 A156835 A156836

KEYWORD

nonn

AUTHOR

Gary W. Adamson, Feb 16 2009

EXTENSIONS

Extended beyond a(14) by R. J. Mathar, Mar 03 2013

STATUS

approved

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Last modified July 22 02:26 EDT 2019. Contains 325210 sequences. (Running on oeis4.)