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A063464 omega(n) = omega(n+2), where omega(n) is the number of distinct prime divisors of n. 2
2, 3, 5, 7, 9, 10, 11, 12, 17, 18, 20, 22, 23, 24, 25, 26, 27, 29, 33, 34, 36, 38, 41, 44, 46, 47, 48, 50, 52, 54, 55, 56, 59, 63, 71, 72, 74, 75, 79, 80, 81, 85, 86, 91, 92, 93, 94, 96, 98, 101, 104, 106, 107, 115, 116, 117, 122, 125, 130, 133, 134, 137, 138, 141, 142 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

MATHEMATICA

Select[Range[200], PrimeNu[#]==PrimeNu[#+2]&] (* Harvey P. Dale, Jun 20 2011 *)

PROG

(PARI) j=[]; for(n=1, 350, if(omega(n)==omega(n+2), j=concat(j, n))); j

(PARI) { n=0; for (m=1, 10^9, if (omega(m) == omega(m + 2), write("b063464.txt", n++, " ", m); if (n==1000, break)) ) } [Harry J. Smith, Aug 22 2009]

CROSSREFS

Sequence in context: A342190 A175415 A304721 * A341518 A325600 A195921

Adjacent sequences:  A063461 A063462 A063463 * A063465 A063466 A063467

KEYWORD

nonn

AUTHOR

Jason Earls, Jul 26 2001

STATUS

approved

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Last modified November 27 09:19 EST 2021. Contains 349365 sequences. (Running on oeis4.)