A249895 a(n+1) is next smallest square not divisible by 10 beginning with a(n), initial term is 5.

5, 529, 529984, 52998485796, 5299848579629072273476, 529984857962907227347600150092608188876380736

Offset

1,1

Links

Hiroaki Yamanouchi, Table of n, a(n) for n = 1..10

Prog

(PARI) a(n)=k=n; s=1; while(s<5*10^7, if(s%10, if(s^2\(10^(#Str(s^2)-#Str(k)))==k, print1(s^2, ", "); k=s^2)); s++)
a(5)
(Python)
def f(x):
..print(x, end=', ')
..n = x
..s = 1
..while s < 10**7:
....if s % 10:
......S = str(s**2)
......if S.startswith(str(n)):
........print(s**2, end=', ')
........n = s**2
....s += 1
f(5)

Crossrefs

Cf. A048559, A048561.

Sequence in context: A110721 A219164 A067446 * A241325 A210821 A302222

Adjacent sequences: A249892 A249893 A249894 * A249896 A249897 A249898

Keyword

nonn,base

Author

Derek Orr, Nov 08 2014

Status

approved