login
A362436
Write out the sequence of squares, 1, 4, 9, 16, ..., then starting with the 16, successively delete the digits of the triangular numbers 1, 3, 6, 10, ...
0
1, 4, 9, 6, 25, 6, 49, 4, 81, 0, 121, 144, 169, 196, 225, 256, 289, 324, 361, 400, 441, 484, 529, 576, 625, 676, 729, 784, 841, 900, 961, 1024, 1089, 16, 1225, 1296, 1369, 1444, 15, 1600, 1681, 1764, 1849, 1936, 2025, 2116, 2209, 2304, 2401, 2500, 2601, 2704, 9, 2916, 3025, 31, 3249, 3364, 3481, 3600, 3721, 3844, 3969, 4096
OFFSET
1,2
COMMENTS
If the result is nonzero, omit any leading zeros.
REFERENCES
GCHQ, The GCHQ Puzzle Book, Penguin, 2016. See page 50, Problem 95(b).
EXAMPLE
Delete 1 from 16 to get 6, then delete the 3 from 36 to get 6, and so on.
CROSSREFS
Sequence in context: A141553 A095065 A061207 * A140694 A152454 A287932
KEYWORD
nonn,base
AUTHOR
N. J. A. Sloane, Apr 21 2023
STATUS
approved