A029910 Start with n; if prime, stop; repeatedly sum prime factors (counted with multiplicity) and add 1, until reach 1, 6 or a prime.

1, 2, 3, 5, 5, 6, 7, 7, 7, 7, 11, 7, 13, 7, 7, 7, 17, 7, 19, 7, 11, 7, 23, 7, 11, 7, 7, 7, 29, 11, 31, 11, 7, 7, 13, 11, 37, 7, 17, 7, 41, 13, 43, 7, 7, 7, 47, 7, 7, 13, 11, 7, 53, 7, 17, 7, 23, 11, 59, 13, 61, 7, 7, 13, 19, 17, 67, 7, 7, 7, 71, 13, 73, 7, 7, 7, 19, 19, 79, 7

Offset

1,2

Links

Table of n, a(n) for n=1..80.

Example

20 -> 2+2+5+1 = 10 -> 2+5+1 = 8 -> 2+2+2+1 = 7 so a(20)=7.

Crossrefs

Sequence in context: A347784 A111164 A255347 * A063677 A078903 A296206

Adjacent sequences: A029907 A029908 A029909 * A029911 A029912 A029913

Keyword

nonn

Author

Dann Toliver

Status

approved