A080180 a(1)=1, a(n+1)=a(n)+spf(Sum(a(i): 1<=i<=n)), where spf=A020639 (smallest prime factor).

1, 2, 5, 7, 10, 15, 17, 20, 27, 29, 36, 49, 51, 320, 339, 341, 344, 1957, 1959, 1962, 1965, 1967, 13390, 13393, 13395, 13406, 13409, 13411, 13414, 13433, 13435, 145544, 145547, 145549, 145552, 145559, 145561, 146040, 146057, 146059, 146090, 146093

Offset

1,2

Comments

a(n+1)=a(n)+spf(A080181(n)) for n>0.

Links

Table of n, a(n) for n=1..42.

Crossrefs

Cf. A080182.

Sequence in context: A018406 A018483 A018270 * A159942 A102339 A172410

Adjacent sequences: A080177 A080178 A080179 * A080181 A080182 A080183

Keyword

nonn

Author

Reinhard Zumkeller, Feb 05 2003

Status

approved