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A066692 Odd n such that tau(n) = tau(n+2), where tau(n) = A000005(n) is the number of divisors of n. 2
3, 5, 11, 17, 29, 33, 41, 55, 59, 71, 85, 91, 93, 101, 107, 123, 137, 141, 143, 149, 159, 179, 183, 185, 191, 197, 201, 203, 213, 215, 217, 219, 227, 235, 239, 243, 247, 265, 269, 281, 299, 301, 303, 311, 319, 321, 327, 339, 341, 347, 391, 393, 411, 413, 415 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Harry J. Smith, Table of n, a(n) for n = 1..1000

PROG

(PARI) for (n=2, 10000, if (numdiv(2*n-1)==numdiv(2*n+1), write1("tau=taun.txt", 2*n-1, ", ")))

(PARI) { n=0; for (m=2, 10^10, if (numdiv(2*m-1) == numdiv(2*m+1), write("b066692.txt", n++, " ", 2*m-1); if (n==1000, return)) ) } \\ Harry J. Smith, Mar 18 2010

CROSSREFS

Sequence in context: A286264 A347027 A147350 * A123533 A144105 A141262

Adjacent sequences:  A066689 A066690 A066691 * A066693 A066694 A066695

KEYWORD

nonn

AUTHOR

Jon Perry, Jan 11 2002

EXTENSIONS

Edited by Dean Hickerson, Jan 13 2002

Offset changed from 0 to 1 by Harry J. Smith, Mar 18 2010

STATUS

approved

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Last modified October 21 18:36 EDT 2021. Contains 348155 sequences. (Running on oeis4.)