A277701 - OEIS

A277701

Positions of ones in A264977; positions of twos in A277330.

1, 5, 13, 29, 41, 61, 85, 125, 173, 209, 253, 281, 313, 349, 421, 509, 565, 629, 701, 845, 929, 1021, 1133, 1261, 1405, 1693, 1861, 2045, 2269, 2525, 2665, 2813, 3121, 3313, 3389, 3725, 3905, 4093, 4541, 4841, 5053, 5209, 5257, 5333, 5629, 5993, 6245, 6629, 6781, 7453, 7813, 8189, 8537, 9085, 9593, 9685, 9905, 10109, 10421, 10517, 10669, 10921

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OFFSET

1,2

COMMENTS

Positions in A260443 of terms that are twice square (terms in A001105, although not all of them are present in A260443).

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..720

FORMULA

A277712(n) = 2*a(n) for all n >= 1.

PROG

(Scheme, with Antti Karttunen's IntSeq-library, two implementations)

(define A277701 (MATCHING-POS 1 1 (lambda (n) (= 1 (A264977 n)))))