A326418 -id:A326418 - cp's OEIS frontend

A362020 Nonnegative numbers k not ending in 0 such that, in decimal representation, the subsequence of digits of k^2 occupying an odd position is equal to the digits of k.

1, 5, 6, 11, 76, 105, 501, 505, 506, 605, 756, 826, 1001, 5941, 10005, 10505, 12731, 13921, 50001, 50005, 50006, 50105, 50501, 50505, 50506, 50605, 60005, 60505, 88705, 100001, 118905, 364231, 592421, 594941, 684006, 1000005, 1000505, 1050005, 1050505, 1355941

Offset: 1

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Chai Wah Wu, Apr 04 2023

nonn
base

Subsequence of A326418. No term starts with the digit 2.

Cf. A326418.

from itertools import count, islice
def A362020_gen(startvalue=0): # generator of terms >= startvalue
    return filter(lambda n:n%10 and n==int(''.join((s:=str(n**2))[len(s)&1^1::2])),count(max(startvalue,0)))
A362020_list = list(islice(A362020_gen(),50))

cp's OEIS Frontend

A362020 Nonnegative numbers k not ending in 0 such that, in decimal representation, the subsequence of digits of k^2 occupying an odd position is equal to the digits of k.

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