The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A175029

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A175029

a(n)=2*n if n is prime, otherwise a(n)=3*n.
(history; published version)

#2 by Russ Cox at Fri Mar 30 17:26:31 EDT 2012

AUTHOR

_Zak Seidov (zakseidov(AT)yahoo.com), _, Nov 04 2009

Discussion

Fri Mar 30

17:26

OEIS Server: https://oeis.org/edit/global/139

#1 by N. J. A. Sloane at Tue Jun 01 03:00:00 EDT 2010

NAME

a(n)=2*n if n is prime, otherwise a(n)=3*n.

DATA

3, 4, 6, 12, 10, 18, 14, 24, 27, 30, 22, 36, 26, 42, 45, 48, 34, 54, 38, 60, 63, 66, 46, 72, 75, 78, 81, 84, 58, 90, 62, 96, 99, 102, 105, 108, 74, 114, 117, 120, 82, 126, 86, 132, 135, 138, 94, 144, 147, 150, 153, 156, 106, 162, 165, 168, 171, 174, 118, 180, 122, 186

OFFSET

1,1

MATHEMATICA

Table[If[PrimeQ[n], 2*n, 3*n], {n, 1, 200}]

CROSSREFS

Cf. A068519, A167480, A167482, A175027, A175028.

KEYWORD

nonn

AUTHOR

Zak Seidov (zakseidov(AT)yahoo.com), Nov 04 2009

STATUS

approved