The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A348856 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A348856

a(n) = Sum_{d|n} (Stirling2(n,d) mod 2).
(history; published version)

#6 by Susanna Cuyler at Tue Nov 02 08:33:26 EDT 2021

STATUS

proposed

approved

#5 by Michel Marcus at Tue Nov 02 06:02:15 EDT 2021

STATUS

editing

proposed

#4 by Michel Marcus at Tue Nov 02 06:02:09 EDT 2021

PROG

(PARI) a(n) = sumdiv(n, d, stirling(n, d, 2) % 2); \\ Michel Marcus, Nov 02 2021

STATUS

proposed

editing

#3 by Ilya Gutkovskiy at Tue Nov 02 05:56:05 EDT 2021

STATUS

editing

proposed

#2 by Ilya Gutkovskiy at Tue Nov 02 04:42:40 EDT 2021

NAME

allocated for Ilya Gutkovskiy

a(n) = Sum_{d|n} (Stirling2(n,d) mod 2).

DATA

1, 2, 2, 3, 2, 3, 2, 4, 3, 4, 2, 4, 2, 3, 3, 5, 2, 5, 2, 5, 3, 3, 2, 5, 3, 3, 4, 4, 2, 5, 2, 6, 3, 4, 3, 7, 2, 3, 3, 6, 2, 5, 2, 4, 4, 3, 2, 6, 2, 5, 4, 4, 2, 5, 2, 5, 4, 3, 2, 6, 2, 3, 4, 7, 3, 5, 2, 6, 3, 5, 2, 8, 2, 4, 4, 4, 3, 5, 2, 7, 4, 4, 2, 6, 4, 3, 3, 5, 2, 7, 3, 4, 3, 3, 2, 7, 2, 3, 6, 6

OFFSET

1,2

MATHEMATICA

Table[DivisorSum[n, Mod[StirlingS2[n, #], 2] &], {n, 1, 100}]

CROSSREFS

Cf. A007306, A008277, A246600, A308037.

KEYWORD

allocated

nonn

AUTHOR

Ilya Gutkovskiy, Nov 02 2021

STATUS

approved

editing

#1 by Ilya Gutkovskiy at Tue Nov 02 04:42:40 EDT 2021

NAME

allocated for Ilya Gutkovskiy

KEYWORD

allocated

STATUS

approved