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A278247
a(n) = least number with the same prime signature as n + (n+1)^2.
4
1, 2, 2, 2, 2, 2, 6, 2, 2, 2, 2, 6, 2, 6, 2, 2, 6, 6, 2, 2, 2, 6, 6, 2, 6, 2, 6, 2, 6, 2, 2, 6, 6, 6, 2, 8, 6, 2, 2, 6, 2, 12, 6, 2, 2, 2, 30, 2, 6, 2, 6, 30, 2, 2, 2, 2, 6, 6, 2, 2, 6, 30, 6, 2, 2, 2, 6, 2, 6, 2, 6, 6, 6, 6, 6, 2, 6, 6, 6, 30, 6, 6, 2, 12, 2, 2, 6, 6, 2, 6, 6, 30, 2, 2, 6, 2, 6, 6, 6, 2, 2, 30, 2, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 2, 2, 6, 30, 6, 6
OFFSET
0,2
COMMENTS
Almost all terms seem to be primorials, 4848 of the first 5000, in other words, most terms of A028387 (in the same range) are squarefree.
LINKS
FORMULA
a(n) = A046523(A028387(n)).
PROG
(Scheme) (define (A278247 n) (A046523 (A028387 n)))
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Nov 21 2016
STATUS
approved