A029914 Start with n; repeatedly sum squares of prime factors (counted with multiplicity), until reach a prime p, then set a(n) = p; if reach a fixed point q, set a(n) = q; set a(n) = 0 if no limit exists.

17, 59, 17, 31, 13

Offset

2,1

Links

Table of n, a(n) for n=2..6.

Example

2 -> 2^2 = 4 -> 2^2 + 2^2 = 8 -> 2^2 + 2^2 + 2^12 = 12 -> 2^2 + 2^2 + 3^2 = 17, prime, so stop; a(2)=17.

Crossrefs

Cf. A029913.

Sequence in context: A146046 A048508 A020879 * A058319 A095089 A106922

Adjacent sequences: A029911 A029912 A029913 * A029915 A029916 A029917

Keyword

nonn,more

Author

Dann Toliver

Extensions

More terms from Michel ten Voorde, Apr 12 2001

Incorrect extension reverted by Sean A. Irvine, Mar 08 2020

Status

approved