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a(n) = the least integer i of the form 4k+3, with A166040(i) = 2n+1.
A. Karttunen, Table of n, a(n) for n = 0..1305
a(n) = A004767(A166094(n)) = A166089(A005408(n)) = A005408(A166087(A005408(n))). See also A166096.
Sequence in context: A192598 A028978 A082628 * A139220 A139221 A006876
Adjacent sequences: A166093 A166094 A166095 * A166097 A166098 A166099
Antti Karttunen, Oct 08 2009