

A067670


Smallest prime of additive persistence n.


0




OFFSET

0,1


REFERENCES

H. J. Hindin, The additive persistence of a number, J. Rec. Math., 7 (No. 2, 1974), 134135.


LINKS

Table of n, a(n) for n=0..4.
N. J. A. Sloane, The persistence of a number, J. Recreational Math., 6 (1973), 9798.
Eric Weisstein's World of Mathematics, Additive Persistence


FORMULA

a(2)=19, 19>10>1, so 2 summation steps are required to reach a singledigit number.


CROSSREFS

Cf. A003001, A045646, A006050.
Sequence in context: A217308 A105076 A103200 * A217071 A159879 A017185
Adjacent sequences: A067667 A067668 A067669 * A067671 A067672 A067673


KEYWORD

hard,more,nonn,base


AUTHOR

Shyam Sunder Gupta, Feb 23 2002


STATUS

approved



