A249894 a(n+1) is next smallest square not divisible by 10 beginning with a(n), initial term is 3.

3, 36, 361, 361201, 36120142809, 3612014280924268428225, 361201428092426842822525044572369542546150009

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(3)
(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(3)

Crossrefs

Cf. A048559, A048561.

Sequence in context: A055303 A274403 A068177 * A099670 A259131 A199258

Adjacent sequences: A249891 A249892 A249893 * A249895 A249896 A249897

Keyword

nonn,base

Author

Derek Orr, Nov 08 2014

Extensions

a(7) corrected by Hiroaki Yamanouchi, Nov 17 2014

Status

approved