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A218455
First of a run of 6 consecutive numbers with same prime signature.
2
380480345, 2713001274, 6282718946, 7209536449, 9809067073, 10684724346, 12008728850, 14824913049, 17231547073, 17552118546, 17659180314, 18036555273, 20473171322, 21507097001, 23676804346, 24742649321, 25401767522, 25694056449, 27656894273, 28259097818
OFFSET
1,1
COMMENTS
A number n is in this sequence iff n and n+1 is in A218448; see the comment there for other characterizations in terms of membership in A175590 or A052214 or A052213.
LINKS
PROG
(PARI) is_A218455(n)={my(s(n)=vecsort(factor(n)[, 2]), t=s(n)); !for(m=n+1, n+5, t!=s(m) & return)}
KEYWORD
nonn
AUTHOR
M. F. Hasler, Oct 29 2012
EXTENSIONS
a(2)-a(20) from Donovan Johnson, Oct 29 2012
STATUS
approved