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1,2

Table of n, a(n) for n=1..16.

David Terr, On the Sums of Digits of Fibonacci Numbers, Fibonacci Quarterly 34, Aug. 1996, pp. 349-355.

(PARI) isok(n) = vecsum(digits(fibonacci(n+1)+fibonacci(n-1), 12)) == n; \\ Michel Marcus, Feb 18 2015

Cf. A020996.

Sequence in context: A169608 A184754 A160241 * A012504 A012689 A098632

Adjacent sequences: A020995 A020996 A020997 * A020999 A021000 A021001

nonn,base

Sven Simon

approved