OFFSET
1,2
COMMENTS
The sequence is monotonically increasing, as stated in the Definition section of A301382.
Equivalently, these are the numbers of the form k * A000030(k) for some k > 0. - Rémy Sigrist, Mar 22 2018
LINKS
Jean-Marc Falcoz, Table of n, a(n) for n = 1..10000
EXAMPLE
P is the product a(n) * [the first digit of a(n)] for every term of A301382:
a(1) = 1 is the product P = 1 * 1,
a(2) = 4 is the product P = 2 * 2,
a(3) = 9 is the product P = 3 * 3,
a(4) = 10 is the product P = 10 * 1,
a(5) = 11 is the product P = 11 * 1,
a(6) = 12 is the product P = 12 * 1,
Etc.
PROG
(PARI) p = vector(131, k, oo); for (n=1, #p, x = n*digits(n)[1]; if (x<=#p, p[x] = min(p[x], n))); for (k=1, #p, if (p[k] != oo, print1 (p[k]*digits(p[k])[1] ", "))) \\ Rémy Sigrist, Mar 22 2018
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Eric Angelini and Jean-Marc Falcoz, Mar 22 2018
STATUS
approved