0,2
For all i, j: a(i) = a(j) => A006047(i) = A006047(j) => A053735(i) = A053735(j).
Antti Karttunen, Table of n, a(n) for n = 0..19683
a(n) = (1/2)*(2 + ((A290091(n)+A290092(n))^2) - A290091(n) - 3*A290092(n)).
(Scheme) (define (A290093 n) (* (/ 1 2) (+ (expt (+ (A290091 n) (A290092 n)) 2) (- (A290091 n)) (- (* 3 (A290092 n))) 2)))
Cf. A000027, A278222, A289813, A289814, A290091, A290092.
Cf. A006047, A053735, A290079 (some of the matched sequences).
Sequence in context: A120879 A118064 A292024 * A186102 A170848 A078017
Adjacent sequences: A290090 A290091 A290092 * A290094 A290095 A290096
nonn
Antti Karttunen, Jul 25 2017
approved