A036435 Digits are nonzero squares.

1, 4, 9, 11, 14, 19, 41, 44, 49, 91, 94, 99, 111, 114, 119, 141, 144, 149, 191, 194, 199, 411, 414, 419, 441, 444, 449, 491, 494, 499, 911, 914, 919, 941, 944, 949, 991, 994, 999, 1111, 1114, 1119, 1141, 1144, 1149, 1191, 1194, 1199, 1411, 1414, 1419, 1441

Offset

1,2

Comments

Invented by the HR concept formation program.

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

S. Colton, Refactorable Numbers - A Machine Invention, J. Integer Sequences, Vol. 2, 1999, #2.

S. Colton, HR - Automatic Theory Formation in Pure Mathematics

Mathematica

Flatten[Table[FromDigits/@Tuples[{1, 4, 9}, n], {n, 4}]] (* Harvey P. Dale, May 18 2015 *)

Prog

(PARI) isok(n) = {digs = digits(n); for (i=1, #digs, if (! digs[i] || ! issquare(digs[i]), return (0)); ); return (1); } \\ Michel Marcus, Aug 31 2013

Crossrefs

Cf. A046030.

Sequence in context: A028845 A050626 A050627 * A162188 A243178 A312834

Adjacent sequences: A036432 A036433 A036434 * A036436 A036437 A036438

Keyword

easy,nonn,base

Author

Simon Colton (simonco(AT)cs.york.ac.uk)

Extensions

More terms from Sam Alexander (pink2001x(AT)hotmail.com).

Status

approved