OFFSET

1,2

COMMENTS

From M. F. Hasler, Nov 20 2019: (Start)

Like the other single-digit terms, zero would satisfy the definition (n = Sum_{i=1..k} d[i]^k where d[1..k] are the base 7 digits of n), but here only positive numbers are considered.

Whenever a(n) ends in zero (n = 11, 17, 22, 38, 57), then a(n+1) = a(n) + 1 is also a solution to the above equation. (End)

LINKS

Joseph Myers, Table of n, a(n) for n = 1..59 (the full list of terms, from Winter)

Gordon L. Miller and Mary T. Whalen, Armstrong Numbers: 153 = 1^3 + 5^3 + 3^3, Fibonacci Quarterly, 30-3 (1992), 221-224.

Eric Weisstein's World of Mathematics, Narcissistic Number

D. T. Winter, Table of Armstrong Numbers (latest backup on web.archive.org from Jan. 2010; page no longer available), published not later than Aug. 2003.

PROG

(PARI) [fromdigits(digits(n, 7))|n<-A010350] \\ M. F. Hasler, Nov 18 2019

CROSSREFS

KEYWORD

base,fini,full,nonn

AUTHOR

EXTENSIONS

Edited by Joseph Myers, Jun 28 2009

STATUS

approved