1,1

If n is in the set {69, 15148, ...} then both numbers n and n+1 are in the sequence. This means that n, n+1 and n+2 are in the sequence A248903. It seems that there exist more such numbers n.

Table of n, a(n) for n=1..12.

Cf. A001359, A248891, A248903.

Sequence in context: A294516 A209078 A244630 * A041556 A041558 A327495

Adjacent sequences: A248891 A248892 A248893 * A248895 A248896 A248897

nonn,more

Jahangeer Kholdi and Farideh Firoozbakht, Nov 22 2014

approved